diff --git a/Jenkinsfile b/Jenkinsfile
index a274ba4..33c9d78 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -29,10 +29,15 @@ pipeline {
                 git config user.name "Jenkins Server"
                 git config user.email jenkins@confdroid.com
                 git fetch origin
-                # Reset the workspace to the exact branch revision that triggered the build.
-                git checkout -B "$BRANCH_NAME" "origin/$BRANCH_NAME"
-                # Create an isolated build branch from the triggering branch.
-                git checkout -B jenkins-build-$BUILD_NUMBER
+              source_branch="${gitlabSourceBranch:-${BRANCH_NAME:-${GIT_LOCAL_BRANCH:-$GIT_BRANCH}}}"
+              source_branch="${source_branch#origin/}"
+              source_branch="${source_branch#refs/heads/}"
+              if [ -z "$source_branch" ]; then
+                source_branch="development"
+              fi
+              echo "Using source branch: $source_branch"
+              # Create an isolated build branch from the triggering branch revision.
+              git checkout -B jenkins-build-$BUILD_NUMBER "origin/$source_branch"
                 # Merge the current master into the build branch before validation.
                 git merge origin/master --no-ff || { echo "Merge conflict detected"; exit 1; }
             '''