diff --git a/.github/workflows/build-test-wheel.yml b/.github/workflows/build-test-wheel.yml
index fdd65a1..c4035c7 100644
--- a/.github/workflows/build-test-wheel.yml
+++ b/.github/workflows/build-test-wheel.yml
@@ -77,7 +77,7 @@ jobs:
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.17.0
         env:
-            CIBW_BEFORE_BUILD: pip install numpy, forthon, 'build<0.10.0'
+            CIBW_BEFORE_BUILD: pip install numpy forthon 'build<0.10.0'
 
 
 #      - name: Build wheels