diff --git a/.github/workflows/llm-ppl-evaluation.yml b/.github/workflows/llm-ppl-evaluation.yml
index 06b89aa5..d10d395d 100644
--- a/.github/workflows/llm-ppl-evaluation.yml
+++ b/.github/workflows/llm-ppl-evaluation.yml
@@ -33,9 +33,9 @@ on:
         required: true
         type: choice
         options:
-          - en
-          - zh
-          - all
+          - "en"
+          - "zh"
+          - "all"
       runs-on:
         description: 'Labels to filter the runners, seperated by comma and must be quoted.'
         default: "accuracy"