diff --git a/pkg/build/agent.tpl b/pkg/build/agent.tpl
index 5ede6e9..ce49055 100644
--- a/pkg/build/agent.tpl
+++ b/pkg/build/agent.tpl
@@ -116,7 +116,7 @@ func register (host string) {
 			continue
 		}
 
-        register_extra = os.Getenv("ECHO_APP_ID") + {{.CommitID}}
+        register_extra = os.Getenv("ECHO_APP_ID") + "{{.CommitID}}"
 		// 注册，直接将元信息放在 ws 地址中
 		v := url.Values{}
 		v.Set("hostname", ps.hostname)