diff --git a/scripts/show_delta b/scripts/show_delta
index 28e67e178194..291ad65e3089 100755
--- a/scripts/show_delta
+++ b/scripts/show_delta
@@ -125,4 +125,5 @@ def main():
 	for line in lines:
 		print (convert_line(line, base_time),)
 
-main()
+if __name__ == "__main__":
+	main()