diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1cc022b8c..1708331d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -71,7 +71,7 @@ jobs:
           maturin build --release -m crates/headroom-py/Cargo.toml --out dist
           pip install --force-reinstall --no-deps dist/headroom_core_py-*.whl
           SITE_PACKAGES=$(python -c "import site; print(site.getsitepackages()[0])")
-          SO_FILE=$(ls "$SITE_PACKAGES"/headroom/_core.cpython-*.so 2>/dev/null | head -1)
+          SO_FILE=$(find "$SITE_PACKAGES/headroom" -maxdepth 1 -name "_core.cpython-*.so" -print -quit 2>/dev/null)
           if [[ -z "$SO_FILE" ]]; then
             echo "error: could not find _core.cpython-*.so under $SITE_PACKAGES/headroom/" >&2
             ls -la "$SITE_PACKAGES/headroom/" || true