diff --git a/src/video/windows/SDL_windowswindow.c b/src/video/windows/SDL_windowswindow.c
index 542a8dbf69..65185ec87c 100644
--- a/src/video/windows/SDL_windowswindow.c
+++ b/src/video/windows/SDL_windowswindow.c
@@ -206,6 +206,8 @@ static int WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, DWORD
         default:
             /* Should never be here */
             SDL_assert_release(SDL_FALSE);
+            *width = 0;
+            *height = 0;
     }
 
     /* Copy the client size in pixels into this rect structure,