diff --git a/.github/actions/before-install/action.yml b/.github/actions/before-install/action.yml
index a327eb3b76..24c968cfa7 100644
--- a/.github/actions/before-install/action.yml
+++ b/.github/actions/before-install/action.yml
@@ -20,7 +20,7 @@ runs:
       run: |
         {
           echo "GIT_HASH=$(git rev-parse HEAD)";
-          echo "BASE_HASH=$(git merge-base origin/${{ github.ref_name }} HEAD)";
+          echo "BASE_HASH=$(git merge-base origin/${{ github.ref }} HEAD)";
           echo "HEAD_HASH=HEAD";
           echo "HEAD_COMMIT_HASH=${TRAVIS_PULL_REQUEST_SHA:-${TRAVIS_COMMIT}}";
           echo "NX_CALCULATION_FLAGS=--all";