diff --git a/Nuclex.Windows.Forms (net-4.0).csproj b/Nuclex.Windows.Forms (net-4.0).csproj
index e57c2cb..05bbbb0 100644
--- a/Nuclex.Windows.Forms (net-4.0).csproj
+++ b/Nuclex.Windows.Forms (net-4.0).csproj
@@ -76,6 +76,7 @@
DialogViewModel.cs
+
ThreadedAction.cs
@@ -157,6 +158,7 @@
+