diff --git a/reactos/subsys/system/calc/winecalc.c b/reactos/subsys/system/calc/winecalc.c
index 2c43009048a..32ed957b0b9 100644
--- a/reactos/subsys/system/calc/winecalc.c
+++ b/reactos/subsys/system/calc/winecalc.c
@@ -194,7 +194,7 @@ int WINAPI WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR cmdline, int cmd
 
     hWnd = CreateWindow( appname,
         appname,
-        WS_OVERLAPPEDWINDOW & ~WS_THICKFRAME & ~WS_MAXIMIZEBOX,
+        WS_CLIPSIBLINGS | (WS_OVERLAPPEDWINDOW & ~WS_THICKFRAME & ~WS_MAXIMIZEBOX),
         CW_USEDEFAULT,
         CW_USEDEFAULT,
         calc.sciMode ? CALC_STANDARD_WIDTH :  CALC_SCIENTIFIC_WIDTH,