diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b3fab3e..94f87b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -129,7 +129,7 @@ jobs:
 
     - name: List all changed files
       run: |
-        ${{ join(steps.changed-files.outputs.all_changed_files, ',') }}
+        "${{ join(steps.changed-files.outputs.all_changed_files, ',') }}"
         for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
           echo "$file was changed"
         done
diff --git a/tests/c.txt b/tests/c.txt
index 06cab46..79d5a4d 100644
--- a/tests/c.txt
+++ b/tests/c.txt
@@ -1,3 +1,4 @@
 c
 foobar
 test1234
+foobar
diff --git a/tests/d.txt b/tests/d.txt
index 0109c5e..84cc93e 100644
--- a/tests/d.txt
+++ b/tests/d.txt
@@ -2,3 +2,4 @@ d
 foobar
 foobar
 
+foobar