diff --git a/.github/workflows/pr_validation.yml b/.github/workflows/pr_validation.yml
index ae17280..a5ae796 100644
--- a/.github/workflows/pr_validation.yml
+++ b/.github/workflows/pr_validation.yml
@@ -49,6 +49,8 @@ jobs:
             .nuke/temp
             ~/.nuget/packages
           key: ${{ runner.os }}-${{ hashFiles('**/global.json', '**/*.csproj') }}
+      - name: dotnet nuget
+        run: dotnet nuget add source -n Phobos ${{ secrets.CUSTOMNUGETSOURCE }}
       - name: Run './build.cmd All'
         run: ./build.cmd All
         env: