diff --git a/temporal-test-server/src/main/java/io/temporal/internal/testservice/StateMachines.java b/temporal-test-server/src/main/java/io/temporal/internal/testservice/StateMachines.java
index ae20d2285..68ded7847 100644
--- a/temporal-test-server/src/main/java/io/temporal/internal/testservice/StateMachines.java
+++ b/temporal-test-server/src/main/java/io/temporal/internal/testservice/StateMachines.java
@@ -958,6 +958,7 @@ private static void requestCancelNexusOperation(
             .setTaskToken(taskToken.toBytes())
             .setRequest(
                 io.temporal.api.nexus.v1.Request.newBuilder()
+                    .putAllHeader(data.scheduledEvent.getNexusHeaderMap())
                     .setCancelOperation(
                         CancelOperationRequest.newBuilder()
                             .setOperationToken(data.operationToken)