diff --git a/.github/workflows/actions.yml b/.github/workflows/actions.yml
index ae7ef57..bdfd059 100644
--- a/.github/workflows/actions.yml
+++ b/.github/workflows/actions.yml
@@ -31,7 +31,7 @@ jobs:
         with:
           submodules: true
       - name: 'setup'
-        if: contains(matrix.vm_image, '20.04')
+        if: contains(matrix.config.vm_image, '20.04')
         run: |
           sudo apt-get install -y g++-10 libstdc++-10-dev
           sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 100 \