diff --git a/.github/workflows/nmodl-wheel.yml b/.github/workflows/nmodl-wheel.yml
index 69575e3f7d..77f8ca9a14 100644
--- a/.github/workflows/nmodl-wheel.yml
+++ b/.github/workflows/nmodl-wheel.yml
@@ -44,6 +44,7 @@ jobs:
         # to supply options, put them in 'env', like:
         env:
           CIBW_SKIP: pp*
+          CIBW_ENVIRONMENT_MACOS: PATH="/usr/local/opt/flex/bin:/usr/local/opt/bison/bin:$PATH"
 
       - uses: actions/upload-artifact@v4
         with: