diff --git a/OpenRa.Core/OpenRa.Core.csproj b/OpenRa.Core/OpenRa.Core.csproj
index be422579ce..f8449b8ca8 100644
--- a/OpenRa.Core/OpenRa.Core.csproj
+++ b/OpenRa.Core/OpenRa.Core.csproj
@@ -34,7 +34,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="FileSystem.cs" />
-    <Compile Include="IMountable.cs" />
+    <Compile Include="IPackage.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Reflect.cs" />
     <Compile Include="Resource.cs" />