diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/trace.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/trace.graphqls
index d867caba6f7a528f0b815ddab401b14e13a2deac..d5e2de8f3639e1796dc2bd1f0e98a0a116289326 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/trace.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/trace.graphqls
@@ -41,6 +41,7 @@ type Span {
   traceId: ID!
   segmentId: ID!
   spanId: Int!
+  parentSpanId: Int!
   refs: [Ref!]!
   startTime: Long!
   endTime: Long!