diff --git a/CapnpC.CSharp.MsBuild.Generation.Tests/TaskItemMock.cs b/CapnpC.CSharp.MsBuild.Generation.Tests/TaskItemMock.cs
index 6cf0f5a..dd6174c 100644
--- a/CapnpC.CSharp.MsBuild.Generation.Tests/TaskItemMock.cs
+++ b/CapnpC.CSharp.MsBuild.Generation.Tests/TaskItemMock.cs
@@ -23,7 +23,12 @@ namespace CapnpC.CSharp.MsBuild.Generation.Tests
 
         public string GetMetadata(string metadataName)
         {
-            return null;
+            if (metadataName == "FullPath")
+            {
+                return ItemSpec;
+            }
+
+            return string.Empty;
         }
 
         public void RemoveMetadata(string metadataName)
diff --git a/CapnpC.CSharp.MsBuild.Generation/CapnpC.CSharp.MsBuild.Generation.csproj b/CapnpC.CSharp.MsBuild.Generation/CapnpC.CSharp.MsBuild.Generation.csproj
index c45d18d..f471873 100644
--- a/CapnpC.CSharp.MsBuild.Generation/CapnpC.CSharp.MsBuild.Generation.csproj
+++ b/CapnpC.CSharp.MsBuild.Generation/CapnpC.CSharp.MsBuild.Generation.csproj
@@ -26,7 +26,6 @@
     <PackageReference Include="Microsoft.VisualStudio.ProjectSystem.SDK" />
     <PackageReference Include="Microsoft.VisualStudio.ProjectSystem.SDK.Tools" />
     <PackageReference Include="Microsoft.VisualStudio.Threading" />
-    <PackageReference Include="Microsoft.Xaml" />
     <PackageReference Include="System.Collections.Immutable" />
   </ItemGroup>