diff --git a/StyletIntegrationTests/Bootstrapper.cs b/StyletIntegrationTests/Bootstrapper.cs
index 3bc3491..48c1089 100644
--- a/StyletIntegrationTests/Bootstrapper.cs
+++ b/StyletIntegrationTests/Bootstrapper.cs
@@ -17,7 +17,7 @@ namespace StyletIntegrationTests
             var message = e.Exception.Message;
             if (e.Exception is TargetInvocationException)
                 message = e.Exception.InnerException.Message;
-            MessageBox.Show(String.Format("Unhandled Exception: {0}", message));
+            IoC.Get<IWindowManager>().ShowMessageBox(String.Format("Unhandled Exception: {0}", message));
             e.Handled = true;
         }
     }