diff --git a/zulip/integrations/bridge_between_zulips/run-interrealm-bridge b/zulip/integrations/bridge_between_zulips/run-interrealm-bridge
index 91e0cca..b748c76 100755
--- a/zulip/integrations/bridge_between_zulips/run-interrealm-bridge
+++ b/zulip/integrations/bridge_between_zulips/run-interrealm-bridge
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 import sys