diff --git a/components/engine/api/server/server.go b/components/engine/api/server/server.go
index c541c76248..fc2acc4c0c 100644
--- a/components/engine/api/server/server.go
+++ b/components/engine/api/server/server.go
@@ -32,7 +32,7 @@ import (
 )
 
 var (
-	activationLock chan struct{} = make(chan struct{})
+	activationLock = make(chan struct{})
 )
 
 type HttpServer struct {