diff --git a/.github/workflows/sync-xcodebuildmcp-docs.yml b/.github/workflows/sync-xcodebuildmcp-docs.yml
index 3323b7f..9c11559 100644
--- a/.github/workflows/sync-xcodebuildmcp-docs.yml
+++ b/.github/workflows/sync-xcodebuildmcp-docs.yml
@@ -43,9 +43,10 @@ jobs:
       - name: Sync manifests
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          INPUT_REF: ${{ inputs.ref }}
         run: |
-          if [ -n "${{ inputs.ref }}" ]; then
-            pnpm run docs:sync -- --ref="${{ inputs.ref }}"
+          if [ -n "$INPUT_REF" ]; then
+            pnpm run docs:sync -- --ref="$INPUT_REF"
           else
             pnpm run docs:sync
           fi