diff --git a/include/wx/compositewin.h b/include/wx/compositewin.h
index f3ead9a14c..9236229fbc 100644
--- a/include/wx/compositewin.h
+++ b/include/wx/compositewin.h
@@ -99,6 +99,10 @@ public:
         BaseWindowClass::SetLayoutDirection(dir);
 
         SetForAllParts(&wxWindowBase::SetLayoutDirection, dir);
+
+        // The child layout almost invariably depends on the layout direction,
+        // so redo it when it changes.
+        SetSize(-1, -1, -1, -1, wxSIZE_AUTO | wxSIZE_FORCE);
     }
 
 #if wxUSE_TOOLTIPS