diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 2ae8ca49b9..cd4925250c 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -22,7 +22,7 @@ jobs:
     - name: Install dependencies
       run: dotnet restore
     - name: Build
-      run: dotnet build --configuration Release --no-restore
+      run: dotnet build --configuration Release --no-restore /p:WarningsAsErrors=nullable
     - name: Content.Tests
       run: dotnet test --no-build Content.Tests/Content.Tests.csproj -v n
     - name: Content.IntegrationTests