diff --git a/dll/cpl/desk/background.c b/dll/cpl/desk/background.c
index 1e12963b356..a92f27b7185 100644
--- a/dll/cpl/desk/background.c
+++ b/dll/cpl/desk/background.c
@@ -1012,7 +1012,7 @@ SetWallpaper(PBACKGROUND_DATA pData)
         return;
     }
 
-    if (FAILED(StringCbCat(szWallpaper, MAX_PATH, TEXT("\\Wallpaper1.bmp"))))
+    if (FAILED(StringCbCat(szWallpaper, sizeof(szWallpaper), TEXT("\\Wallpaper1.bmp"))))
     {
         return;
     }