diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index ab9e360..1ac2304 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -25,8 +25,10 @@ jobs:
         python -m pip install pytest
         # Can comment out when next Mathics3 core and Mathics-scanner are released
         # python -m pip install -e git+https://github.com/Mathics3/mathics-scanner#egg=Mathics-Scanner[full]
-        python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
-        (cd src/mathics3 && bash ./admin-tools/make-op-tables.sh)
+        # python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
+        git clone --branch fixes_for_the_new_module_organization https://github.com/Mathics3/mathics-core
+        (cd mathics-core && pip3 install -e .[full])
+        (cd mathics-core && bash ./admin-tools/make-op-tables.sh) 
         # python -m pip install Mathics3[full]
     - name: install pymathics natlang
       run: |