diff --git a/src/msw/control.cpp b/src/msw/control.cpp
index 6593d6eed1..ba76513c75 100644
--- a/src/msw/control.cpp
+++ b/src/msw/control.cpp
@@ -156,7 +156,7 @@ bool wxControl::MSWCreateControl(const wxChar *classname,
     InheritAttributes();
 
     // set the size now if no initial size specified
-    if ( w == 0 || h == 0 )
+    if ( w <= 0 || h <= 0 )
     {
         SetBestSize(size);
     }