diff --git a/xunit.runner.wpf/ViewModel/MainViewModel.cs b/xunit.runner.wpf/ViewModel/MainViewModel.cs
index 4151699..a549553 100644
--- a/xunit.runner.wpf/ViewModel/MainViewModel.cs
+++ b/xunit.runner.wpf/ViewModel/MainViewModel.cs
@@ -462,6 +462,7 @@ namespace Xunit.Runner.Wpf.ViewModel
         {
             foreach (var assembly in assemblies.ToList())
             {
+                assemblyWatcher.RemoveAssembly(assembly.FileName);
                 RemoveAssemblyTestCases(assembly.FileName);
                 Assemblies.Remove(assembly);
             }