diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj b/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj
index 36afcac4..4b5d20b8 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj	
@@ -206,7 +206,10 @@
     <Compile Include="Devices\PC\Laptop.cs" />
     <Compile Include="Devices\ReconfigurableDevice.cs" />
     <Compile Include="Devices\VolumeDeviceChangeEventArgs.cs" />
+    <Compile Include="DeviceTypeInterfaces\ILanguageLabel.cs" />
+    <Compile Include="DeviceTypeInterfaces\ILanguageProvider.cs" />
     <Compile Include="DeviceTypeInterfaces\IHasBranding.cs" />
+    <Compile Include="DeviceTypeInterfaces\ILanguageDefinition.cs" />
     <Compile Include="DeviceTypeInterfaces\IMobileControl.cs" />
     <Compile Include="Factory\DeviceFactory.cs" />
     <Compile Include="Factory\IDeviceFactory.cs" />