diff --git a/src/DurableTask.Core/TaskOrchestrationContext.cs b/src/DurableTask.Core/TaskOrchestrationContext.cs
index b290b0072..6a8771500 100644
--- a/src/DurableTask.Core/TaskOrchestrationContext.cs
+++ b/src/DurableTask.Core/TaskOrchestrationContext.cs
@@ -386,7 +386,10 @@ public void HandleExecutionTerminatedEvent(ExecutionTerminatedEvent terminatedEv
 
         public void CompleteOrchestration(string result)
         {
-            CompleteOrchestration(result, null, OrchestrationStatus.Completed);
+            if (!executionTerminated)
+            {
+                CompleteOrchestration(result, null, OrchestrationStatus.Completed);
+            }
         }
 
         public void FailOrchestration(Exception failure)