diff --git a/ci/scripts/linter.sh b/ci/scripts/linter.sh
index e58249169..72ce5674f 100755
--- a/ci/scripts/linter.sh
+++ b/ci/scripts/linter.sh
@@ -5,6 +5,7 @@ git fetch -a
 current_branch=$(git rev-parse --abbrev-ref HEAD)
 
 echo "current branch ${current_branch}"
+echo "github base ref = $GITHUB_BASE_REF"
 BASE_SHA=$(git merge-base origin/$GITHUB_BASE_REF $current_branch)
 
 echo "base sha = ${BASE_SHA}"