diff --git a/.github/workflows/changed-files.yml b/.github/workflows/changed-files.yml
index 57927eed..550d7dfb 100644
--- a/.github/workflows/changed-files.yml
+++ b/.github/workflows/changed-files.yml
@@ -2,6 +2,9 @@ name: changed-files
 on:
   pull_request:
 
+env:
+  LOCAL_DIR_FOR_SYNC: check-change
+
 jobs:
   changes-in-ga-steps:
     runs-on: ubuntu-latest
@@ -52,10 +55,10 @@ jobs:
         uses: tj-actions/changed-files@v41
         with:
           dir_names: true
-          dir_names_max_depth: 2 # e.g. check-change/app
+          dir_names_max_depth: 2 # e.g. check-change/test-2
           json: true
           escape_json: false
-          files: 'check-change/**'
+          files: "${{ env.LOCAL_DIR_FOR_SYNC }}/**"
           files_ignore: '**/README.md'
         # Reference: https://github.com/tj-actions/changed-files/blob/main/.github/workflows/matrix-test.yml
 
@@ -69,6 +72,8 @@ jobs:
     strategy:
       matrix:
         dir: ${{ fromJson(needs.get-changed-dirs.outputs.changed_dirs) }}
+        exclude: # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymatrixexclude
+          - dir: check-change # exclude the parent dir (you can't use ${{ env.LOCAL_DIR_FOR_SYNC }} in matrix)
     needs:
       - get-changed-dirs
     steps: