diff --git a/.gitea/workflows/benchmark.yaml b/.gitea/workflows/benchmark.yaml
index 9053469..440fbc9 100644
--- a/.gitea/workflows/benchmark.yaml
+++ b/.gitea/workflows/benchmark.yaml
@@ -71,7 +71,7 @@ jobs:
           
           # 3. Create a directory structure based on the branch
           # This allows the UI to "switch between branches"
-          SAFE_PR_NAME="${GITHUB_HEAD_REF//\//-}"
+          SAFE_PR_NAME=$(printf "%s" "$GITHUB_HEAD_REF" | tr '/' '-')
           DEST_DIR="target_bench_repo/data/$SAFE_PR_NAME/$(date +%s)"
           mkdir -p "$DEST_DIR"