diff --git a/.github/workflows/changed-files.yml b/.github/workflows/changed-files.yml
index 142803fb..edc95e79 100644
--- a/.github/workflows/changed-files.yml
+++ b/.github/workflows/changed-files.yml
@@ -62,7 +62,7 @@ jobs:
 
   do-sth-on-changed-dirs:
     runs-on: ubuntu-latest
-    if: ${{ needs.get-changed-dirs.outputs.changed_dirs != '' }}  # Without it, the strategy parser will fail if the changed_directories is empty.
+    if: ${{ needs.get-changed-dirs.outputs.changed_dirs != '[]' }}  # Without it, the strategy parser will fail if the changed_directories is empty.
     strategy:
       matrix:
         dir: ${{ fromJson(needs.get-changed-dirs.outputs.changed_dirs) }}