diff --git a/apm-network/src/main/proto/TraceSegmentService.proto b/apm-network/src/main/proto/TraceSegmentService.proto
index 755356dc9..65ed18504 100644
--- a/apm-network/src/main/proto/TraceSegmentService.proto
+++ b/apm-network/src/main/proto/TraceSegmentService.proto
@@ -20,7 +20,7 @@ message TraceSegmentObject {
     string traceSegmentId = 1;
     repeated TraceSegmentReference refs = 2;
     repeated SpanObject spans = 3;
-    int32 applicationId = 4;
+    int32 applicationInstanceId = 4;
     int32 applicationInstanceId = 5;
 }