Remove redundant braces
diff --git a/common.graphqls b/common.graphqls
index ce6ee5d..43eeb8b 100644
--- a/common.graphqls
+++ b/common.graphqls
@@ -111,5 +111,5 @@
 
 extend type Query {
     # Query Health Checker module for the status of OAP server
-    checkHealth(): HealthStatus!
+    checkHealth: HealthStatus!
 }