diff --git a/.github/workflows/aomp-shell.yml b/.github/workflows/aomp-shell.yml
index 27e573e1e..3878282e2 100644
--- a/.github/workflows/aomp-shell.yml
+++ b/.github/workflows/aomp-shell.yml
@@ -17,7 +17,7 @@ jobs:
         id: changed-files
         uses: tj-actions/changed-files@22103cc46bda19c2b464ffe86db46df6922fd323
         with:
-          separator: ' '
+          separator: '\n'
           skip_initial_fetch: true
           base_sha: 'HEAD~1'
           sha: 'HEAD'
@@ -29,8 +29,8 @@ jobs:
       - name: Run shellcheck
         run: |
           shellcheck_status=0
-          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
-            if [[ $file == *.sh ]] || [[ $(file "$file") =~ "shell script" ]]; then
+          while read -r file; do
+            if [[ "$file" == *.sh ]] || [[ $(file "$file") =~ "shell script" ]]; then
               file_dir=$(dirname "$file")
               file_name=$(basename "$file")
 
@@ -43,6 +43,6 @@ jobs:
 
               popd || exit 1
             fi
-          done
+          done <<< "${{ steps.changed-files.outputs.all_changed_files }}"
           exit $shellcheck_status
         shell: bash {0}