diff --git a/.github/actions/ngen-build/action.yaml b/.github/actions/ngen-build/action.yaml
index 72f8f27cc1..07006a7e3f 100644
--- a/.github/actions/ngen-build/action.yaml
+++ b/.github/actions/ngen-build/action.yaml
@@ -166,7 +166,7 @@ runs:
           run: |
             export BOOST_ROOT="$(pwd)/boost_1_72_0"
             export CFLAGS="-fsanitize=address -O1 -g -fno-omit-frame-pointer"
-            export CXXFLAGS="-fsanitize=address -O1 -g -fno-omit-frame-pointer"
+            export CXXFLAGS="-fsanitize=address -O1 -g -fno-omit-frame-pointer -pedantic-errors"
             . .venv/bin/activate
             [ ! -d "$BOOST_ROOT" ] && echo "Error: no Boost root found at $BOOST_ROOT" && exit 1
             cmake -B ${{ inputs.build-dir }} \