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 d867caba6..d5e2de8f3 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!