diff --git a/MatterControl.csproj b/MatterControl.csproj
index 7f266eaab..25aa2ad4c 100644
--- a/MatterControl.csproj
+++ b/MatterControl.csproj
@@ -112,6 +112,7 @@
     <Compile Include="CrashTracker.cs" />
     <Compile Include="CustomWidgets\AltGroupBox.cs" />
     <Compile Include="CustomWidgets\DoubleSolidSlider.cs" />
+    <Compile Include="CustomWidgets\FatFlatClickWidget.cs" />
     <Compile Include="CustomWidgets\FlowSpacers.cs" />
     <Compile Include="CustomWidgets\PanelSeparator.cs" />
     <Compile Include="CustomWidgets\SlideWidget.cs" />