diff --git a/NUnitAppAction.cs b/NUnitAppAction.cs
index e635e76..031f0d5 100644
--- a/NUnitAppAction.cs
+++ b/NUnitAppAction.cs
@@ -76,7 +76,7 @@ protected override void RunTests()
 
             var agent = this.Context.Agent;
             {
-                var fileOps = (IFileOperationsExecuter)agent;
+                var fileOps = agent.GetService<IFileOperationsExecuter>();
                 var nunitPath = fileOps.GetWorkingDirectory(this.Context.ApplicationId, this.Context.DeployableId ?? 0, this.ExePath);
 
                 var tmpFileName = fileOps.CombinePath(this.Context.TempDirectory, Guid.NewGuid().ToString() + ".xml");