diff --git a/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_cron_file b/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_cron_file
index 1d8120e8e4..b5ba07de97 100755
--- a/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_cron_file
+++ b/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_cron_file
@@ -7,7 +7,7 @@ import time
 from typing import Tuple
 
 
-def nagios_from_file(results_file: str, max_time_diff: int = 60 * 2) -> "Tuple[int, str]":
+def nagios_from_file(results_file: str, max_time_diff: int = 60 * 2) -> Tuple[int, str]:
     """Returns a nagios-appropriate string and return code obtained by
     parsing the desired file on disk. The file on disk should be of format