diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9a196725..d188b8e5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       - name: 'Get Changed Files'
         id: 'files'
         run: |
-          CHANGED_FILES=$(git diff --name-only "${BASE_SHA:-$BEFORE_SHA}...${HEAD_SHA:-GITHUB_REF}")
+          CHANGED_FILES=$(git diff --name-only "${BASE_SHA:-$BEFORE_SHA}...${HEAD_SHA:-$GITHUB_REF}")
           echo "::notice::Changed files: $CHANGED_FILES"
           {
             echo "added_modified<<EOF"