diff --git a/Stack/Opc.Ua.Core/Opc.Ua.Core.csproj b/Stack/Opc.Ua.Core/Opc.Ua.Core.csproj
index cae3f591db..05f15e9fa5 100644
--- a/Stack/Opc.Ua.Core/Opc.Ua.Core.csproj
+++ b/Stack/Opc.Ua.Core/Opc.Ua.Core.csproj
@@ -79,6 +79,7 @@
     <Otherwise>
       <ItemGroup>
         <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.1" />
+        <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="9.0.1" />
       </ItemGroup>
     </Otherwise>
   </Choose>