diff --git a/.github/workflows/build_prepare.yaml b/.github/workflows/build_prepare.yaml
index 72a6fdd..9a5836e 100644
--- a/.github/workflows/build_prepare.yaml
+++ b/.github/workflows/build_prepare.yaml
@@ -72,7 +72,7 @@ jobs:
 
             - name: Test credential
               run: |
-                echo ${S3_AK:0:4}" "${S3_SK:0:4}"
+                echo "${S3_AK:0:4}" "${S3_SK:0:4}"
               env:
                 S3_AK: ${{ secrets.S3_AK }}
                 S3_SK: ${{ secrets.S3_SK }}