diff --git a/oap-server/server-starter/src/main/resources/oal/core.oal b/oap-server/server-starter/src/main/resources/oal/core.oal
index 73e7a183fe8dc43f3b9c47a5c79419d71a809d15..e79befafd7f0cbf9a167a0658f7c9efedf8acd87 100755
--- a/oap-server/server-starter/src/main/resources/oal/core.oal
+++ b/oap-server/server-starter/src/main/resources/oal/core.oal
@@ -47,7 +47,7 @@ service_instance_relation_server_percentile = from(ServiceInstanceRelation.laten
 
 // Service Instance Scope metrics
 service_instance_sla = from(ServiceInstance.*).percent(status == true);
-service_instance_resp_time= from(ServiceInstance.latency).longAvg();
+service_instance_resp_time = from(ServiceInstance.latency).longAvg();
 service_instance_cpm = from(ServiceInstance.*).cpm();
 
 // Endpoint scope metrics