diff --git a/handlers/main.yml b/handlers/main.yml
index d9988fd..1f81c91 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -3,4 +3,4 @@
 - name: restart mysql
   action: service name=mysql state=restarted enabled=yes
   when: mysql_notify_restart
-  serial: {{ mysql_serial_restart }}
+  serial: "{{ mysql_serial_restart }}"