diff --git a/reactos/lib/user32/controls/combo.c b/reactos/lib/user32/controls/combo.c
index 6f778e42a1d..1bfa9cf32e2 100644
--- a/reactos/lib/user32/controls/combo.c
+++ b/reactos/lib/user32/controls/combo.c
@@ -491,6 +491,9 @@ static LRESULT COMBO_WindowPosChanging(
     }
   }
 
+  posChanging->cx = max(posChanging->cx, 0);
+  posChanging->cy = max(posChanging->cy, 0);
+
   return 0;
 }
 
diff --git a/reactos/lib/user32/windows/defwnd.c b/reactos/lib/user32/windows/defwnd.c
index 0a7295aee86..7cbc0e9c87a 100644
--- a/reactos/lib/user32/windows/defwnd.c
+++ b/reactos/lib/user32/windows/defwnd.c
@@ -1,4 +1,4 @@
-/* $Id: defwnd.c,v 1.136 2004/05/12 20:34:38 navaraf Exp $
+/* $Id: defwnd.c,v 1.137 2004/05/13 20:24:26 navaraf Exp $
  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS user32.dll
@@ -898,6 +898,11 @@ DefWndHandleWindowPosChanging(HWND hWnd, WINDOWPOS* Pos)
             if (Pos->cy < minTrack.y) Pos->cy = minTrack.y;
         }
     }
+    else
+    {
+        Pos->cx = max(Pos->cx, 0);
+        Pos->cy = max(Pos->cy, 0);
+    }
     return 0;
 }