diff --git a/diff-sha.sh b/diff-sha.sh
index 5daf90c8..a8784a78 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -41,6 +41,7 @@ fi
 if [[ -z $GITHUB_BASE_REF ]]; then
   echo "Running on a push event..."
   TARGET_BRANCH=${GITHUB_REF/refs\/heads\//} && exit_status=$? || exit_status=$?
+  TARGET_BRANCH=${TARGET_BRANCH/refs\/tags\//}
   CURRENT_BRANCH=$TARGET_BRANCH && exit_status=$? || exit_status=$?
 
   echo "::debug::Getting HEAD SHA..."