diff --git a/src/libslic3r/TriangleMeshSlicer.cpp b/src/libslic3r/TriangleMeshSlicer.cpp
index 7779278fd..04481da7e 100644
--- a/src/libslic3r/TriangleMeshSlicer.cpp
+++ b/src/libslic3r/TriangleMeshSlicer.cpp
@@ -405,7 +405,7 @@ void slice_facet_with_slabs(
     assert(min_layer == zs.end() ? max_layer == zs.end() : *min_layer >= min_z);
     assert(max_layer == zs.end() || *max_layer > max_z);
 
-    auto emit_slab_edge = [&lines, &lines_mutex, num_edges](IntersectionLine il, size_t slab_id, bool reverse) {
+    auto emit_slab_edge = [&lines, &lines_mutex](IntersectionLine il, size_t slab_id, bool reverse) {
         if (reverse)
             il.reverse();
         boost::lock_guard<std::mutex> l(lines_mutex[(slab_id + 32) >> 6]);
diff --git a/src/libslic3r/TriangleSelector.cpp b/src/libslic3r/TriangleSelector.cpp
index 24fac0b7b..b24a97506 100644
--- a/src/libslic3r/TriangleSelector.cpp
+++ b/src/libslic3r/TriangleSelector.cpp
@@ -1224,7 +1224,8 @@ bool TriangleSelector::has_facets(const std::pair<std::vector<std::pair<int, int
     std::vector<int> parents_children;
     parents_children.reserve(64);
 
-    for (auto [triangle_id, ibit] : data.first) {
+    for (const std::pair<int, int> &triangle_id_and_ibit : data.first) {
+        int ibit = triangle_id_and_ibit.second;
         assert(ibit < data.second.size());
         auto next_nibble = [&data, &ibit = ibit]() {
             int n = 0;
diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index c06fc598b..ef4940a0d 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -202,8 +202,6 @@ public:
         vertices_and_normals_interleaved_size = 0;
         triangle_indices_size = 0;
         quad_indices_size = 0;
-        static const float min = std::numeric_limits<float>::lowest();
-        static const float max = std::numeric_limits<float>::max();
         m_bounding_box.setEmpty();
     }
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
index 201a16618..034707a21 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
@@ -458,7 +458,7 @@ void TriangleSelectorMmuGui::render(ImGuiWrapper *imgui)
             GLIndexedVertexArray *iva = nullptr;
             if (tr.is_selected_by_seed_fill())
                 iva = &m_iva_seed_fill;
-            else if (int color = int(tr.get_state()); color < m_iva_colors.size())
+            else if (int color = int(tr.get_state()); color < int(m_iva_colors.size()))
                 iva = &m_iva_colors[color];
             if (iva) {
                 if (iva->vertices_and_normals_interleaved.size() + 18 > iva->vertices_and_normals_interleaved.capacity())