diff --git a/include/wx/private/wxprintf.h b/include/wx/private/wxprintf.h
index f34d68495e..5854d894d7 100644
--- a/include/wx/private/wxprintf.h
+++ b/include/wx/private/wxprintf.h
@@ -302,6 +302,7 @@ bool wxPrintfConvSpec<CharType>::Parse(const CharType *format)
                     break;
                 }
                 // else: fall-through, 'I' is MSVC equivalent of C99 'z'
+                wxFALLTHROUGH;
 #endif      // __WINDOWS__
 
             case wxT('z'):
diff --git a/src/common/list.cpp b/src/common/list.cpp
index efaf12a195..decaf8bb36 100644
--- a/src/common/list.cpp
+++ b/src/common/list.cpp
@@ -51,6 +51,7 @@ bool wxListKey::operator==(wxListKeyValue value) const
             wxFAIL_MSG(wxT("bad key type."));
             // let compiler optimize the line above away in release build
             // by not putting return here...
+            wxFALLTHROUGH;
 
         case wxKEY_STRING:
             return *m_key.string == *value.string;