diff --git a/.github/workflows/cooker-selfhosted.yml b/.github/workflows/cooker-selfhosted.yml
index 64640af6..d068989a 100644
--- a/.github/workflows/cooker-selfhosted.yml
+++ b/.github/workflows/cooker-selfhosted.yml
@@ -64,8 +64,8 @@ jobs:
       # if the branch is coming from a PR the tag should be manually built
       - name: "Generate version tag"
         run: |
-          /bin/bash automation_tools/version_extractor.sh
-          echo "MANIFEST_VERSION=$($fetch_manifest_version)" >> $GITHUB_ENV
+          source automation_tools/version_extractor.sh
+          echo "MANIFEST_VERSION=$(fetch_manifest_version)" >> $GITHUB_ENV
           if [[ "$BRANCH_NAME" == 'refs/'* ]]; then
             pr_number=$(echo ${{env.BRANCH_NAME}} | awk -F'/' '{print $3}')
             source_branch=$(curl -s "https://api.github.com/repos/XargonWan/RetroDECK/pulls/$pr_number" | jq -r '.head.ref')