diff --git a/include/components/controller.hpp b/include/components/controller.hpp
index 582d4c2b..1dd96232 100644
--- a/include/components/controller.hpp
+++ b/include/components/controller.hpp
@@ -83,7 +83,7 @@ class controller : public signal_receiver<SIGN_PRIORITY_CONTROLLER, sig_ev::proc
   stateflag m_reload{false};
   stateflag m_waiting{false};
 
-  sigset_t m_waitmask;
+  sigset_t m_waitmask{};
   vector<thread> m_threads;
 
   watch_t m_confwatch;
diff --git a/include/components/eventloop.hpp b/include/components/eventloop.hpp
index 08aa4342..d2751583 100644
--- a/include/components/eventloop.hpp
+++ b/include/components/eventloop.hpp
@@ -105,7 +105,7 @@ class eventloop : public signal_receiver<SIGN_PRIORITY_EVENTLOOP, process_quit,
   /**
    * @brief Flag to indicate current run state
    */
-  stateflag m_running;
+  stateflag m_running{};
 
   /**
    * @brief Time to wait for subsequent events
@@ -130,7 +130,7 @@ class eventloop : public signal_receiver<SIGN_PRIORITY_EVENTLOOP, process_quit,
   /**
    * @brief Mutex used to guard input data
    */
-  std::mutex m_inputlock;
+  std::mutex m_inputlock{};
 
   /**
    * @brief Input data
diff --git a/include/modules/xbacklight.hpp b/include/modules/xbacklight.hpp
index a50406da..6daeb41e 100644
--- a/include/modules/xbacklight.hpp
+++ b/include/modules/xbacklight.hpp
@@ -48,7 +48,7 @@ namespace modules {
 
     connection& m_connection;
     monitor_t m_output;
-    xcb_window_t m_proxy;
+    xcb_window_t m_proxy{};
 
     ramp_t m_ramp;
     label_t m_label;
diff --git a/include/utils/command.hpp b/include/utils/command.hpp
index 7219dcb5..1fd59acb 100644
--- a/include/utils/command.hpp
+++ b/include/utils/command.hpp
@@ -66,11 +66,11 @@ namespace command_util {
 
     string m_cmd;
 
-    int m_stdout[2];
-    int m_stdin[2];
+    int m_stdout[2]{};
+    int m_stdin[2]{};
 
-    pid_t m_forkpid;
-    int m_forkstatus;
+    pid_t m_forkpid{};
+    int m_forkstatus{};
 
     concurrency_util::spin_lock m_pipelock;
   };
diff --git a/include/x11/tray_manager.hpp b/include/x11/tray_manager.hpp
index 7fa56a1a..8b302ab5 100644
--- a/include/x11/tray_manager.hpp
+++ b/include/x11/tray_manager.hpp
@@ -135,11 +135,11 @@ class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify
   const logger& m_log;
   vector<shared_ptr<tray_client>> m_clients;
 
-  tray_settings m_opts;
+  tray_settings m_opts{};
 
   xcb_gcontext_t m_gc{0};
   xcb_pixmap_t m_pixmap{0};
-  graphics_util::root_pixmap m_rootpixmap;
+  graphics_util::root_pixmap m_rootpixmap{};
   uint16_t m_prevwidth{0};
   uint16_t m_prevheight{0};
 
@@ -156,7 +156,7 @@ class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify
 
   bool m_restacked{false};
 
-  std::mutex m_mtx;
+  std::mutex m_mtx{};
 
   chrono::time_point<chrono::system_clock, chrono::milliseconds> m_drawtime;
 
diff --git a/src/adapters/net.cpp b/src/adapters/net.cpp
index ef1fce6b..087fc644 100644
--- a/src/adapters/net.cpp
+++ b/src/adapters/net.cpp
@@ -154,8 +154,8 @@ namespace net {
    * interface is a TUN/TAP device
    */
   void network::check_tuntap() {
-    struct ethtool_drvinfo driver;
-    struct ifreq request;
+    struct ethtool_drvinfo driver {};
+    struct ifreq request {};
 
     driver.cmd = ETHTOOL_GDRVINFO;
 
@@ -219,8 +219,8 @@ namespace net {
       return false;
     }
 
-    struct ifreq request;
-    struct ethtool_cmd data;
+    struct ifreq request {};
+    struct ethtool_cmd data {};
 
     memset(&request, 0, sizeof(request));
     strncpy(request.ifr_name, m_interface.c_str(), IFNAMSIZ - 1);
@@ -244,8 +244,8 @@ namespace net {
       return false;
     }
 
-    struct ethtool_value data;
-    struct ifreq request;
+    struct ethtool_value data {};
+    struct ifreq request {};
 
     memset(&request, 0, sizeof(request));
     strncpy(request.ifr_name, m_interface.c_str(), IFNAMSIZ - 1);
@@ -285,7 +285,7 @@ namespace net {
       return false;
     }
 
-    struct iwreq req;
+    struct iwreq req {};
 
     if (iw_get_ext(socket_fd, m_interface.c_str(), SIOCGIWMODE, &req) == -1) {
       return false;
@@ -341,7 +341,7 @@ namespace net {
   void wireless_network::query_essid(const int& socket_fd) {
     char essid[IW_ESSID_MAX_SIZE + 1];
 
-    struct iwreq req;
+    struct iwreq req {};
     req.u.essid.pointer = &essid;
     req.u.essid.length = sizeof(essid);
     req.u.essid.flags = 0;
@@ -357,8 +357,8 @@ namespace net {
    * Query for device driver quality values
    */
   void wireless_network::query_quality(const int& socket_fd) {
-    iwrange range;
-    iwstats stats;
+    iwrange range{};
+    iwstats stats{};
 
     // Fill range
     if (iw_get_range_info(socket_fd, m_interface.c_str(), &range) == -1) {
diff --git a/src/components/eventloop.cpp b/src/components/eventloop.cpp
index e460f2d0..079b7c89 100644
--- a/src/components/eventloop.cpp
+++ b/src/components/eventloop.cpp
@@ -59,7 +59,7 @@ void eventloop::start() {
   dispatch_modules();
 
   while (m_running) {
-    event evt, next;
+    event evt{}, next{};
 
     m_queue.wait_dequeue(evt);
 
diff --git a/src/components/renderer.cpp b/src/components/renderer.cpp
index 2f1cedd5..16f59ddc 100644
--- a/src/components/renderer.cpp
+++ b/src/components/renderer.cpp
@@ -94,7 +94,7 @@ renderer::renderer(connection& conn, signal_emitter& emitter, const logger& logg
       uint32_t mask{0};
       uint32_t value_list[32]{0};
 
-      xcb_params_gc_t params;
+      xcb_params_gc_t params{};
       XCB_AUX_ADD_PARAM(&mask, &params, foreground, colors[i]);
       XCB_AUX_ADD_PARAM(&mask, &params, graphics_exposures, 0);
       xutils::pack_values(mask, &params, value_list);
diff --git a/src/drawtypes/label.cpp b/src/drawtypes/label.cpp
index 1ba559e1..1a6cf66d 100644
--- a/src/drawtypes/label.cpp
+++ b/src/drawtypes/label.cpp
@@ -128,7 +128,8 @@ namespace drawtypes {
 
     string text;
 
-    struct side_values padding, margin;
+    struct side_values padding {
+    }, margin{};
 
     if (required) {
       text = conf.get<string>(section, name);
diff --git a/src/main.cpp b/src/main.cpp
index 1f0bcd75..f5bc0ccf 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -55,7 +55,7 @@ int main(int argc, char** argv) {
     //==================================================
     // Block all signals by default
     //==================================================
-    sigset_t blockmask;
+    sigset_t blockmask{};
     sigfillset(&blockmask);
 
     if (pthread_sigmask(SIG_BLOCK, &blockmask, nullptr) == -1) {
diff --git a/src/modules/fs.cpp b/src/modules/fs.cpp
index c4aff3cb..b94a0eed 100644
--- a/src/modules/fs.cpp
+++ b/src/modules/fs.cpp
@@ -57,7 +57,7 @@ namespace modules {
   bool fs_module::update() {
     m_mounts.clear();
 
-    struct statvfs buffer;
+    struct statvfs buffer {};
     struct mntent* mnt = nullptr;
 
     for (auto&& mountpoint : m_mountpoints) {
diff --git a/src/modules/xworkspaces.cpp b/src/modules/xworkspaces.cpp
index f9e70224..263acfb2 100644
--- a/src/modules/xworkspaces.cpp
+++ b/src/modules/xworkspaces.cpp
@@ -122,7 +122,7 @@ namespace modules {
     auto names = ewmh_util::get_desktop_names(m_ewmh.get());
     vector<position> viewports;
     size_t num{0};
-    position pos;
+    position pos{};
 
     if (m_monitorsupport) {
       viewports = ewmh_util::get_desktop_viewports(m_ewmh.get());
diff --git a/src/utils/bspwm.cpp b/src/utils/bspwm.cpp
index cc20e9a2..2ab8045c 100644
--- a/src/utils/bspwm.cpp
+++ b/src/utils/bspwm.cpp
@@ -16,7 +16,7 @@ namespace bspwm_util {
     auto children = conn.query_tree(conn.screen()->root).children();
 
     for (auto it = children.begin(); it != children.end(); it++) {
-      xcb_icccm_get_wm_class_reply_t reply;
+      xcb_icccm_get_wm_class_reply_t reply{};
       reply.class_name = reply.instance_name = nullptr;
 
       if (xcb_icccm_get_wm_class_reply(conn, xcb_icccm_get_wm_class(conn, *it), &reply, nullptr)) {
@@ -76,7 +76,7 @@ namespace bspwm_util {
       return env_path;
     }
 
-    struct sockaddr_un sa;
+    struct sockaddr_un sa {};
     char* host = nullptr;
     int dsp = 0;
     int scr = 0;
diff --git a/src/utils/file.cpp b/src/utils/file.cpp
index 3fe57684..8a7ad002 100644
--- a/src/utils/file.cpp
+++ b/src/utils/file.cpp
@@ -38,7 +38,7 @@ namespace file_util {
    * Checks if the given file exist
    */
   bool exists(const string& filename) {
-    struct stat buffer;
+    struct stat buffer {};
     return stat(filename.c_str(), &buffer) == 0;
   }
 
@@ -83,7 +83,7 @@ namespace file_util {
   bool is_fifo(string filename) {
     auto fileptr = factory_util::unique<file_ptr>(filename);
     int fd = fileno((*fileptr)());
-    struct stat statbuf;
+    struct stat statbuf {};
     fstat(fd, &statbuf);
     return S_ISFIFO(statbuf.st_mode);
   }
diff --git a/src/utils/process.cpp b/src/utils/process.cpp
index 8cc4ed29..47b0d5da 100644
--- a/src/utils/process.cpp
+++ b/src/utils/process.cpp
@@ -108,7 +108,7 @@ namespace process_util {
   }
 
   void unblock_signal(int sig) {
-    sigset_t sigmask;
+    sigset_t sigmask{};
     sigemptyset(&sigmask);
     sigaddset(&sigmask, sig);
     if (pthread_sigmask(SIG_UNBLOCK, &sigmask, nullptr) == -1) {
diff --git a/src/utils/socket.cpp b/src/utils/socket.cpp
index 9539ed63..05754a56 100644
--- a/src/utils/socket.cpp
+++ b/src/utils/socket.cpp
@@ -18,7 +18,7 @@ namespace socket_util {
    * Constructor: establishing socket connection
    */
   unix_connection::unix_connection(string&& path) : m_socketpath(path) {
-    struct sockaddr_un socket_addr;
+    struct sockaddr_un socket_addr {};
     socket_addr.sun_family = AF_UNIX;
 
     if ((m_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
diff --git a/src/utils/string.cpp b/src/utils/string.cpp
index 2b51108e..835d6d75 100644
--- a/src/utils/string.cpp
+++ b/src/utils/string.cpp
@@ -246,7 +246,7 @@ namespace string_util {
    * @endcode
    */
   string from_stream(const std::basic_ostream<char>& os) {
-    return static_cast<const stringstream&>(os).str();
+    return dynamic_cast<const stringstream&>(os).str();
   }
 
   /**
diff --git a/src/x11/color.cpp b/src/x11/color.cpp
index 9f852f3a..c4fd5e0b 100644
--- a/src/x11/color.cpp
+++ b/src/x11/color.cpp
@@ -35,7 +35,7 @@ string color::source() const {
 }
 
 color::operator XRenderColor() const {
-  XRenderColor x;
+  XRenderColor x{};
   x.red = color_util::red_channel<uint16_t>(m_color);
   x.green = color_util::green_channel<uint16_t>(m_color);
   x.blue = color_util::blue_channel<uint16_t>(m_color);
diff --git a/src/x11/draw.cpp b/src/x11/draw.cpp
index 25e1a120..2864858f 100644
--- a/src/x11/draw.cpp
+++ b/src/x11/draw.cpp
@@ -37,8 +37,8 @@ namespace draw_util {
     };
     struct iovec xcb_parts[7];
     uint8_t xcb_lendelta[2];
-    xcb_void_cookie_t xcb_ret;
-    xcb_poly_text_8_request_t xcb_out;
+    xcb_void_cookie_t xcb_ret{};
+    xcb_poly_text_8_request_t xcb_out{};
     xcb_out.pad0 = 0;
     xcb_out.drawable = d;
     xcb_out.gc = gc;
diff --git a/src/x11/ewmh.cpp b/src/x11/ewmh.cpp
index 8a9097c9..9abcf6d0 100644
--- a/src/x11/ewmh.cpp
+++ b/src/x11/ewmh.cpp
@@ -22,7 +22,7 @@ namespace ewmh_util {
   bool supports(xcb_ewmh_connection_t* ewmh, xcb_atom_t atom, int screen) {
     bool supports{false};
 
-    xcb_ewmh_get_atoms_reply_t reply;
+    xcb_ewmh_get_atoms_reply_t reply{};
     reply.atoms = nullptr;
 
     if (!xcb_ewmh_get_supported_reply(ewmh, xcb_ewmh_get_supported(ewmh, screen), &reply, nullptr)) {
@@ -44,7 +44,7 @@ namespace ewmh_util {
   }
 
   string get_wm_name(xcb_ewmh_connection_t* conn, xcb_window_t win) {
-    xcb_ewmh_get_utf8_strings_reply_t utf8_reply;
+    xcb_ewmh_get_utf8_strings_reply_t utf8_reply{};
     if (xcb_ewmh_get_wm_name_reply(conn, xcb_ewmh_get_wm_name(conn, win), &utf8_reply, nullptr)) {
       return get_reply_string(&utf8_reply);
     }
@@ -52,7 +52,7 @@ namespace ewmh_util {
   }
 
   string get_visible_name(xcb_ewmh_connection_t* conn, xcb_window_t win) {
-    xcb_ewmh_get_utf8_strings_reply_t utf8_reply;
+    xcb_ewmh_get_utf8_strings_reply_t utf8_reply{};
     if (xcb_ewmh_get_wm_visible_name_reply(conn, xcb_ewmh_get_wm_visible_name(conn, win), &utf8_reply, nullptr)) {
       return get_reply_string(&utf8_reply);
     }
@@ -60,7 +60,7 @@ namespace ewmh_util {
   }
 
   string get_icon_name(xcb_ewmh_connection_t* conn, xcb_window_t win) {
-    xcb_ewmh_get_utf8_strings_reply_t utf8_reply;
+    xcb_ewmh_get_utf8_strings_reply_t utf8_reply{};
     if (xcb_ewmh_get_wm_icon_name_reply(conn, xcb_ewmh_get_wm_icon_name(conn, win), &utf8_reply, nullptr)) {
       return get_reply_string(&utf8_reply);
     }
@@ -86,7 +86,7 @@ namespace ewmh_util {
 
   vector<position> get_desktop_viewports(xcb_ewmh_connection_t* conn, int screen) {
     vector<position> viewports;
-    xcb_ewmh_get_desktop_viewport_reply_t reply;
+    xcb_ewmh_get_desktop_viewport_reply_t reply{};
 
     if (!xcb_ewmh_get_desktop_viewport_reply(conn, xcb_ewmh_get_desktop_viewport(conn, screen), &reply, nullptr)) {
       return viewports;
@@ -102,7 +102,7 @@ namespace ewmh_util {
 
   vector<string> get_desktop_names(xcb_ewmh_connection_t* conn, int screen) {
     vector<string> names;
-    xcb_ewmh_get_utf8_strings_reply_t reply;
+    xcb_ewmh_get_utf8_strings_reply_t reply{};
 
     if (!xcb_ewmh_get_desktop_names_reply(conn, xcb_ewmh_get_desktop_names(conn, screen), &reply, nullptr)) {
       return names;
diff --git a/src/x11/graphics.cpp b/src/x11/graphics.cpp
index 50b1752d..ab5fd08b 100644
--- a/src/x11/graphics.cpp
+++ b/src/x11/graphics.cpp
@@ -60,7 +60,7 @@ namespace graphics_util {
    */
   bool create_gc(connection& conn, xcb_drawable_t drawable, xcb_gcontext_t* gc) {
     try {
-      xcb_params_gc_t params;
+      xcb_params_gc_t params{};
 
       uint32_t mask = 0;
       uint32_t values[32];
diff --git a/src/x11/icccm.cpp b/src/x11/icccm.cpp
index 4b156831..1f1b1b99 100644
--- a/src/x11/icccm.cpp
+++ b/src/x11/icccm.cpp
@@ -4,7 +4,7 @@ POLYBAR_NS
 
 namespace icccm_util {
   string get_wm_name(xcb_connection_t* conn, xcb_window_t win) {
-    xcb_icccm_get_text_property_reply_t reply;
+    xcb_icccm_get_text_property_reply_t reply{};
     if (xcb_icccm_get_wm_name_reply(conn, xcb_icccm_get_wm_name(conn, win), &reply, nullptr)) {
       return get_reply_string(&reply);
     }
diff --git a/src/x11/tray_client.cpp b/src/x11/tray_client.cpp
index 2f467b0a..026759d3 100644
--- a/src/x11/tray_client.cpp
+++ b/src/x11/tray_client.cpp
@@ -88,7 +88,7 @@ void tray_client::ensure_state() const {
 void tray_client::reconfigure(int16_t x, int16_t y) const {
   uint32_t configure_mask = 0;
   uint32_t configure_values[7];
-  xcb_params_configure_window_t configure_params;
+  xcb_params_configure_window_t configure_params{};
 
   XCB_AUX_ADD_PARAM(&configure_mask, &configure_params, width, m_width);
   XCB_AUX_ADD_PARAM(&configure_mask, &configure_params, height, m_height);
diff --git a/src/x11/tray_manager.cpp b/src/x11/tray_manager.cpp
index 540c1791..e2a568b6 100644
--- a/src/x11/tray_manager.cpp
+++ b/src/x11/tray_manager.cpp
@@ -360,7 +360,7 @@ void tray_manager::reconfigure_window() {
 
     uint32_t mask = 0;
     uint32_t values[7];
-    xcb_params_configure_window_t params;
+    xcb_params_configure_window_t params{};
 
     XCB_AUX_ADD_PARAM(&mask, &params, width, width);
     XCB_AUX_ADD_PARAM(&mask, &params, x, x);
@@ -610,7 +610,7 @@ void tray_manager::restack_window() {
 
     uint32_t mask = 0;
     uint32_t values[7];
-    xcb_params_configure_window_t params;
+    xcb_params_configure_window_t params{};
 
     XCB_AUX_ADD_PARAM(&mask, &params, sibling, m_opts.sibling);
     XCB_AUX_ADD_PARAM(&mask, &params, stack_mode, XCB_STACK_MODE_ABOVE);
diff --git a/src/x11/window.cpp b/src/x11/window.cpp
index a62b5556..79ca9ced 100644
--- a/src/x11/window.cpp
+++ b/src/x11/window.cpp
@@ -50,7 +50,7 @@ window window::reconfigure_geom(uint16_t w, uint16_t h, int16_t x, int16_t y) {
   uint32_t mask{0};
   uint32_t values[7]{0};
 
-  xcb_params_configure_window_t params;
+  xcb_params_configure_window_t params{};
   XCB_AUX_ADD_PARAM(&mask, &params, width, w);
   XCB_AUX_ADD_PARAM(&mask, &params, height, h);
   XCB_AUX_ADD_PARAM(&mask, &params, x, x);
@@ -69,7 +69,7 @@ window window::reconfigure_pos(int16_t x, int16_t y) {
   uint32_t mask{0};
   uint32_t values[2]{0};
 
-  xcb_params_configure_window_t params;
+  xcb_params_configure_window_t params{};
   XCB_AUX_ADD_PARAM(&mask, &params, x, x);
   XCB_AUX_ADD_PARAM(&mask, &params, y, y);
 
diff --git a/src/x11/xkb.cpp b/src/x11/xkb.cpp
index 83029946..ada69e49 100644
--- a/src/x11/xkb.cpp
+++ b/src/x11/xkb.cpp
@@ -99,7 +99,7 @@ namespace xkb_util {
       return results;
     }
 
-    xcb_xkb_get_names_value_list_t values;
+    xcb_xkb_get_names_value_list_t values{};
     void* buffer = xcb_xkb_get_names_value_list(reply);
     xcb_xkb_get_names_value_list_unpack(buffer, reply->nTypes, reply->indicators, reply->virtualMods, reply->groupNames,
         reply->nKeys, reply->nKeyAliases, reply->nRadioGroups, reply->which, &values);
@@ -140,7 +140,7 @@ namespace xkb_util {
       return results;
     }
 
-    xcb_xkb_get_names_value_list_t values;
+    xcb_xkb_get_names_value_list_t values{};
     void* buffer = xcb_xkb_get_names_value_list(reply);
     xcb_xkb_get_names_value_list_unpack(buffer, reply->nTypes, reply->indicators, reply->virtualMods, reply->groupNames,
         reply->nKeys, reply->nKeyAliases, reply->nRadioGroups, reply->which, &values);
diff --git a/src/x11/xlib.cpp b/src/x11/xlib.cpp
index 2884ff45..046d40cc 100644
--- a/src/x11/xlib.cpp
+++ b/src/x11/xlib.cpp
@@ -17,7 +17,7 @@ namespace xlib {
 
   shared_ptr<Visual> get_visual(int screen) {
     if (!g_visual_ptr) {
-      XVisualInfo info;
+      XVisualInfo info{};
       if (XMatchVisualInfo(get_display().get(), screen, 32, TrueColor, &info)) {
         g_visual_ptr = shared_ptr<Visual>(info.visual, [=](Visual* v) { XFree(v); });
       }
diff --git a/src/x11/xresources.cpp b/src/x11/xresources.cpp
index 0660e2e1..d6d96c98 100644
--- a/src/x11/xresources.cpp
+++ b/src/x11/xresources.cpp
@@ -80,7 +80,7 @@ string xresource_manager::load_value(const string& key, const string& res_type,
     return "";
   }
   char* type = nullptr;
-  XrmValue ret;
+  XrmValue ret{};
   XrmGetResource(m_db, key.c_str(), res_type.c_str(), &type, &ret);
 
   if (ret.addr != nullptr && !std::strncmp(res_type.c_str(), type, n)) {