diff --git a/roles/nagios_client/files/scripts/check_rabbitmq_size b/roles/nagios_client/files/scripts/check_rabbitmq_size
index 4d0b7b3604..112891ad7d 100644
--- a/roles/nagios_client/files/scripts/check_rabbitmq_size
+++ b/roles/nagios_client/files/scripts/check_rabbitmq_size
@@ -22,5 +22,5 @@ if str(messages) > sys.argv[3]:
     print ('WARNING: %s' % msg)
     sys.exit(1)
 
-print 'OK: %s' % msg
+print ('OK: %s' % msg)
 sys.exit(0)