diff --git a/src/AddIns/BackendBindings/XamlBinding/XamlBinding.Tests/MockTextEditor.cs b/src/AddIns/BackendBindings/XamlBinding/XamlBinding.Tests/MockTextEditor.cs
index f03ea20cd4..a97c538c2b 100644
--- a/src/AddIns/BackendBindings/XamlBinding/XamlBinding.Tests/MockTextEditor.cs
+++ b/src/AddIns/BackendBindings/XamlBinding/XamlBinding.Tests/MockTextEditor.cs
@@ -39,6 +39,7 @@ namespace ICSharpCode.XamlBinding.Tests
 			Dictionary<string, string> referencedAssemblies = new Dictionary<string, string>() {
 				{ "System", null },
 				{ "System.Xml", null },
+				{ "System.Xaml", typeof(System.Xaml.XamlReader).Assembly.Location },
 				{ "WindowsBase", typeof(System.Windows.Media.Matrix).Assembly.Location },
 				{ "System.Core", null },
 				{ "PresentationCore", typeof(System.Windows.Media.Brush).Assembly.Location },
diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/WeakReferenceTests.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/WeakReferenceTests.cs
index 959130138f..0775aafb44 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/WeakReferenceTests.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/WeakReferenceTests.cs
@@ -105,7 +105,7 @@ namespace ICSharpCode.AvalonEdit
 		static void GarbageCollect()
 		{
 			GC.WaitForPendingFinalizers();
-			GC.Collect();
+			GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
 			GC.WaitForPendingFinalizers();
 		}