diff --git a/include/wx/unix/glx11.h b/include/wx/unix/glx11.h
index 50305778c4..a27c470332 100644
--- a/include/wx/unix/glx11.h
+++ b/include/wx/unix/glx11.h
@@ -147,6 +147,9 @@ public:
     // backwards compatibility and also because wxGTK has it we could start
     // using it for the same purpose in wxX11 too some day.
     virtual void *GetXVisualInfo()
+#ifdef __WXGTK20__
+                                    wxOVERRIDE
+#endif
     {
         return wxGLCanvasX11::GetDefaultXVisualInfo();
     }
diff --git a/src/gtk/display.cpp b/src/gtk/display.cpp
index d6562511b8..db1116820d 100644
--- a/src/gtk/display.cpp
+++ b/src/gtk/display.cpp
@@ -58,7 +58,7 @@ wx_gdk_screen_get_monitor_workarea(GdkScreen* screen, int monitor, GdkRectangle*
         if (GDK_IS_X11_SCREEN(screen))
 #endif
         {
-            GdkRectangle rect = { 0 };
+            GdkRectangle rect = { 0, 0, 0, 0 };
             wxGetWorkAreaX11(GDK_SCREEN_XSCREEN(screen),
                 rect.x, rect.y, rect.width, rect.height);
             // in case _NET_WORKAREA result is too large
diff --git a/src/unix/dlunix.cpp b/src/unix/dlunix.cpp
index 1905c97aca..cf51417a25 100644
--- a/src/unix/dlunix.cpp
+++ b/src/unix/dlunix.cpp
@@ -285,7 +285,7 @@ wxDynamicLibraryDetailsArray wxDynamicLibrary::ListLoaded()
 void* wxDynamicLibrary::GetModuleFromAddress(const void* addr, wxString* path)
 {
 #ifdef HAVE_DLADDR
-    Dl_info di = { 0 };
+    Dl_info di = { }; // 0 initialize whatever fields the struct has
 
     // At least under Solaris dladdr() takes non-const void*.
     if ( dladdr(const_cast<void*>(addr), &di) == 0 )
diff --git a/src/unix/secretstore.cpp b/src/unix/secretstore.cpp
index f18d5a0e6d..e72ce36248 100644
--- a/src/unix/secretstore.cpp
+++ b/src/unix/secretstore.cpp
@@ -235,6 +235,11 @@ private:
     // helper function to make changing the code later simpler.
     static SecretSchema* GetSchema()
     {
+        // SecretSchema struct has some "reserved" fields in it which we don't
+        // want to initialize, but this results in this warning if it's
+        // enabled, so just suppress it here.
+        wxGCC_WARNING_SUPPRESS(missing-field-initializers)
+
         static SecretSchema s_schema =
             {
                 "org.freedesktop.Secret.Generic",
@@ -246,6 +251,8 @@ private:
                 }
             };
 
+        wxGCC_WARNING_RESTORE(missing-field-initializers)
+
         return &s_schema;
     }