diff --git a/lib/scripts/lyxpreview2bitmap.py b/lib/scripts/lyxpreview2bitmap.py
index 674c33e611..e7887b6a4a 100755
--- a/lib/scripts/lyxpreview2bitmap.py
+++ b/lib/scripts/lyxpreview2bitmap.py
@@ -532,4 +532,4 @@ def main(argv):
     return (0, dvipng_metrics)
 
 if __name__ == "__main__":
-    exit(main(sys.argv)[0])
+    sys.exit(main(sys.argv)[0])