diff --git a/src/slic3r/GUI/BonjourDialog.cpp b/src/slic3r/GUI/BonjourDialog.cpp
index 1885dda7b..0e05a517c 100644
--- a/src/slic3r/GUI/BonjourDialog.cpp
+++ b/src/slic3r/GUI/BonjourDialog.cpp
@@ -171,7 +171,7 @@ void BonjourDialog::on_reply(BonjourReplyEvent &e)
 	// Filter replies based on selected technology
 	const auto model = e.reply.txt_data.find("model");
 	const bool sl1 = model != e.reply.txt_data.end() && model->second == "SL1";
-	if (tech == ptFFF && sl1 || tech == ptSLA && !sl1) {
+	if ((tech == ptFFF && sl1) || (tech == ptSLA && !sl1)) {
 		return;
 	}
 
diff --git a/src/slic3r/GUI/ConfigWizard.cpp b/src/slic3r/GUI/ConfigWizard.cpp
index aacbfdc52..8b08f6f7f 100644
--- a/src/slic3r/GUI/ConfigWizard.cpp
+++ b/src/slic3r/GUI/ConfigWizard.cpp
@@ -330,8 +330,8 @@ PagePrinters::PagePrinters(ConfigWizard *parent, wxString title, wxString shortn
     const auto families = vendor.families();
     for (const auto &family : families) {
         const auto filter = [&](const VendorProfile::PrinterModel &model) {
-            return (model.technology == ptFFF && technology & T_FFF
-                    || model.technology == ptSLA && technology & T_SLA)
+            return ((model.technology == ptFFF && technology & T_FFF)
+                    || (model.technology == ptSLA && technology & T_SLA))
                 && model.family == family;
         };
 
@@ -810,7 +810,7 @@ void ConfigWizardIndex::on_paint(wxPaintEvent & evt)
         const Item& item = items[i];
         unsigned x = em_w/2 + item.indent * em_w;
 
-        if (i == item_active || item_hover >= 0 && i == (size_t)item_hover) {
+        if (i == item_active || (item_hover >= 0 && i == (size_t)item_hover)) {
             dc.DrawBitmap(bullet_blue.bmp(), x, y + yoff_icon, false);
         }
         else if (i < item_active)  { dc.DrawBitmap(bullet_black.bmp(), x, y + yoff_icon, false); }
diff --git a/src/slic3r/GUI/FirmwareDialog.cpp b/src/slic3r/GUI/FirmwareDialog.cpp
index 15a09aa71..7865aecf2 100644
--- a/src/slic3r/GUI/FirmwareDialog.cpp
+++ b/src/slic3r/GUI/FirmwareDialog.cpp
@@ -442,8 +442,7 @@ void FirmwareDialog::priv::avr109_lookup_port(Avr109Pid usb_pid)
 	auto ports = Utils::scan_serial_ports_extended();
 	ports.erase(std::remove_if(ports.begin(), ports.end(), [=](const SerialPortInfo &port ) {
 		return port.id_vendor != USB_VID_PRUSA ||
-			port.id_product != usb_pid.boot &&
-			port.id_product != usb_pid.app;
+			(port.id_product != usb_pid.boot && port.id_product != usb_pid.app);
 	}), ports.end());
 
 	if (ports.size() == 0) {
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
index 8934bc52b..17db953d4 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
@@ -15,48 +15,6 @@
 namespace Slic3r {
 namespace GUI {
 
-
-class GLGizmoCutPanel : public wxPanel
-{
-public:
-    GLGizmoCutPanel(wxWindow *parent);
-
-    void display(bool display);
-private:
-    bool m_active;
-    wxCheckBox *m_cb_rotate;
-    wxButton *m_btn_cut;
-    wxButton *m_btn_cancel;
-};
-
-GLGizmoCutPanel::GLGizmoCutPanel(wxWindow *parent)
-    : wxPanel(parent)
-    , m_active(false)
-    , m_cb_rotate(new wxCheckBox(this, wxID_ANY, _(L("Rotate lower part upwards"))))
-    , m_btn_cut(new wxButton(this, wxID_OK, _(L("Perform cut"))))
-    , m_btn_cancel(new wxButton(this, wxID_CANCEL, _(L("Cancel"))))
-{
-    enum { MARGIN = 5 };
-
-    auto *sizer = new wxBoxSizer(wxHORIZONTAL);
-
-    auto *label = new wxStaticText(this, wxID_ANY, _(L("Cut object:")));
-    sizer->Add(label, 0, wxALL | wxALIGN_CENTER, MARGIN);
-    sizer->Add(m_cb_rotate, 0, wxALL | wxALIGN_CENTER, MARGIN);
-    sizer->AddStretchSpacer();
-    sizer->Add(m_btn_cut, 0, wxALL | wxALIGN_CENTER, MARGIN);
-    sizer->Add(m_btn_cancel, 0, wxALL | wxALIGN_CENTER, MARGIN);
-
-    SetSizer(sizer);
-}
-
-void GLGizmoCutPanel::display(bool display)
-{
-    Show(display);
-    GetParent()->Layout();
-}
-
-
 const double GLGizmoCut::Offset = 10.0;
 const double GLGizmoCut::Margin = 20.0;
 const std::array<float, 3> GLGizmoCut::GrabberColor = { 1.0, 0.5, 0.0 };
@@ -188,7 +146,7 @@ void GLGizmoCut::on_render_input_window(float x, float y, float bottom_limit, co
     m_imgui->begin(_(L("Cut")), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse);
 
     ImGui::PushItemWidth(m_imgui->scaled(5.0f));
-    bool _value_changed = ImGui::InputDouble("Z", &m_cut_z, 0.0f, 0.0f, "%.2f");
+    ImGui::InputDouble("Z", &m_cut_z, 0.0f, 0.0f, "%.2f");
 
     m_imgui->checkbox(_(L("Keep upper part")), m_keep_upper);
     m_imgui->checkbox(_(L("Keep lower part")), m_keep_lower);
diff --git a/src/slic3r/GUI/ImGuiWrapper.cpp b/src/slic3r/GUI/ImGuiWrapper.cpp
index ca1538bf7..b6abf641a 100644
--- a/src/slic3r/GUI/ImGuiWrapper.cpp
+++ b/src/slic3r/GUI/ImGuiWrapper.cpp
@@ -326,9 +326,9 @@ bool ImGuiWrapper::combo(const wxString& label, const std::vector<std::string>&
     int selection_out = -1;
     bool res = false;
 
-    const char *selection_str = selection < options.size() ? options[selection].c_str() : "";
+    const char *selection_str = selection < (int)options.size() ? options[selection].c_str() : "";
     if (ImGui::BeginCombo("", selection_str)) {
-        for (int i = 0; i < options.size(); i++) {
+        for (int i = 0; i < (int)options.size(); i++) {
             if (ImGui::Selectable(options[i].c_str(), i == selection)) {
                 selection_out = i;
             }