diff --git a/test/Grains/TestGrains/DeadlockGrain.cs b/test/Grains/TestGrains/DeadlockGrain.cs
index 4e000e9e280..e3ffae92674 100644
--- a/test/Grains/TestGrains/DeadlockGrain.cs
+++ b/test/Grains/TestGrains/DeadlockGrain.cs
@@ -85,6 +85,7 @@ public class CallChainReentrancyGrain : Grain, ICallChainReentrancyGrain
         public async Task CallChain(ICallChainObserver observer, List<(string TargetGrain, ReentrancyCallType CallType)> callChain, int callIndex, CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
+            var unblocker = _unblocker;
             await observer.OnEnter(Id, callIndex);
             try
             {
@@ -100,19 +101,19 @@ public async Task CallChain(ICallChainObserver observer, List<(string TargetGrai
                 switch (op.CallType)
                 {
                     case ReentrancyCallType.Regular:
-                        await Task.WhenAny(_unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
+                        await Task.WhenAny(unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
                         break;
                     case ReentrancyCallType.AllowCallChainReentrancy:
                         {
                             using var _ = RequestContext.AllowCallChainReentrancy();
-                            await Task.WhenAny(_unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
+                            await Task.WhenAny(unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
                             break;
                         }
 
                     case ReentrancyCallType.SuppressCallChainReentrancy:
                         {
                             using var _ = RequestContext.SuppressCallChainReentrancy();
-                            await Task.WhenAny(_unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
+                            await Task.WhenAny(unblocker.Task, target.CallChain(observer, newChain, nextCallIndex, cancellationToken));
                             break;
                         }
                 }