diff --git a/reactos/dll/win32/user32/windows/dialog.c b/reactos/dll/win32/user32/windows/dialog.c
index 0c7dd3002fb..44433999c9c 100644
--- a/reactos/dll/win32/user32/windows/dialog.c
+++ b/reactos/dll/win32/user32/windows/dialog.c
@@ -611,7 +611,7 @@ static LPCSTR DIALOG_ParseTemplate32( LPCSTR template, DLG_TEMPLATE * result )
     }
 
     /* First control is on dword boundary */
-    return (LPCSTR)((((int)p) + 3) & ~3);
+    return (LPCSTR)((((UINT_PTR)p) + 3) & ~3);
 }
 
  /***********************************************************************