diff --git a/defaults/main.yml b/defaults/main.yml
index ae021a697e0f5071367564af663fbdd6830bef01..7ed7187e92265220b5e60b6621b848b12b389597 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,6 +1,6 @@
 ---
 
-zabbix_agent_url: http://repo.zabbix.com/zabbix/3.0/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.0-1+xenial_all.deb
+zabbix_agent_url: 'http://repo.zabbix.com/zabbix/3.0/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.0-1+xenial_all.deb'
 
 zabbix_agent_logfile_size: 0
 zabbix_agent_server: 127.0.0.1