diff --git a/.github/workflows/test_suite.yml b/.github/workflows/test_suite.yml
index a3832e7..e28fb58 100644
--- a/.github/workflows/test_suite.yml
+++ b/.github/workflows/test_suite.yml
@@ -43,6 +43,7 @@ jobs:
 
       - name: 'Convert demos to integration tests'
         run: |
+          . /home/firedrake/firedrake/bin/activate
           make convert_demos
 
       - name: 'Lint'