diff --git a/.github/workflows/pull-request-approved.yml b/.github/workflows/pull-request-approved.yml
index a39ff01146..eb0e45fadc 100644
--- a/.github/workflows/pull-request-approved.yml
+++ b/.github/workflows/pull-request-approved.yml
@@ -24,7 +24,7 @@ jobs:
           chmod +x ./.github/workflows/scripts/get-xetabase-branch.sh
           echo "github.event.pull_request.base.ref: ${{ github.event.pull_request.base.ref }}"
           echo "github.event.pull_request.head.ref: ${{ github.event.pull_request.head.ref }}"
-          xetabase_branch=$(./.github/workflows/scripts/get-xetabase-branch.sh ${{ github.event.pull_request.head.ref }})
+          xetabase_branch=$(./.github/workflows/scripts/get-xetabase-branch.sh ${{ github.event.pull_request.base.ref }})
           echo "__Xetabase ref:__ \"${xetabase_branch}\"" | tee -a ${GITHUB_STEP_SUMMARY}
           echo "xetabase_branch=${xetabase_branch}" >> $GITHUB_OUTPUT
         env:
diff --git a/.github/workflows/scripts/get-xetabase-branch.sh b/.github/workflows/scripts/get-xetabase-branch.sh
index a1eb7e529c..90ab2c7574 100644
--- a/.github/workflows/scripts/get-xetabase-branch.sh
+++ b/.github/workflows/scripts/get-xetabase-branch.sh
@@ -19,11 +19,11 @@ get_xetabase_branch() {
     return 0
   fi
 
-  # Check if the branch name starts with "release-" and follows the patterns "release-a.b.x" or "release-a.b.c.x"
-  if [[ "$input_branch" =~ ^release-([0-9]+)\.([0-9]+)\.x$ ]] || [[ "$input_branch" =~ ^release-([0-9]+)\.([0-9]+)\.([0-9]+)\.x$ ]]; then
+  # Check if the branch name starts with "release-" and follows the patterns "release-a.x.x" or "release-a.b.x"
+  if [[ "$input_branch" =~ ^release-([0-9]+)\.x\.x$ ]] || [[ "$input_branch" =~ ^release-([0-9]+)\.([0-9]+)\.x$ ]]; then
     # Extract the MAJOR part of the branch name
     MAJOR=${BASH_REMATCH[1]}
-    # Calculate the XETABASE_MAJOR by subtracting 3 from MAJOR
+    # Calculate the XETABASE_MAJOR by subtracting 1 from MAJOR of opencga
     XETABASE_MAJOR=$((MAJOR - 1))
     # Check if the XETABASE_MAJOR is negative
     if (( XETABASE_MAJOR < 0 )); then