diff --git a/src/msw/toolbar.cpp b/src/msw/toolbar.cpp
index af56c305d0..ebdd261a82 100644
--- a/src/msw/toolbar.cpp
+++ b/src/msw/toolbar.cpp
@@ -921,7 +921,7 @@ bool wxToolBar::Realize()
                     button.iBitmap = IsVertical() ? sizeControl.y : sizeControl.x;
                 }
 
-                // Fall through
+                wxFALLTHROUGH;
 
             case wxTOOL_STYLE_SEPARATOR:
                 if ( tool->IsStretchableSpace() )