diff --git a/.github/workflows/geneva_metrics.yml b/.github/workflows/geneva_metrics.yml
index 4b28545bf..65ccc9ae3 100644
--- a/.github/workflows/geneva_metrics.yml
+++ b/.github/workflows/geneva_metrics.yml
@@ -38,11 +38,11 @@ jobs:
           mkdir -p "$GITHUB_WORKSPACE/otel_cpp/build"
           cd "$GITHUB_WORKSPACE/otel_cpp/build"
           cmake .. -DOPENTELEMETRY_INSTALL=ON
-          cmake --build . -j${nproc}
+          cmake --build . -j$(nproc)
           cmake --install . --prefix "$HOME/prebuilt-otel"
           mkdir -p "$GITHUB_WORKSPACE/otel_cpp_contrib/exporters/geneva/build"
           cd "$GITHUB_WORKSPACE/otel_cpp_contrib/exporters/geneva/build"
           cmake .. "-DCMAKE_PREFIX_PATH=$HOME/prebuilt-otel" \
             -DBUILD_TESTING=ON -DBUILD_EXAMPLE=ON
-          cmake --build . -j${nproc}
+          cmake --build . -j$(nproc)
           ctest