diff --git a/Assembly-CSharp.csproj b/Assembly-CSharp.csproj
index 229d9fd..92d00f3 100644
--- a/Assembly-CSharp.csproj
+++ b/Assembly-CSharp.csproj
@@ -78,6 +78,7 @@
     <Compile Include="Assets\Scripts\Worker.cs" />
     <Compile Include="Assets\Scripts\WorkerSpawner.cs" />
     <Compile Include="Assets\Scripts\Resource.cs" />
+    <Compile Include="Assets\Data\Scripts\DataClasses\UpgradeData.cs" />
     <Compile Include="Assets\Scripts\AutoTargetSystem.cs" />
     <Compile Include="Assets\Scripts\CreepDataComponent.cs" />
     <Compile Include="Assets\Scripts\BuildingSlotButton.cs" />