diff --git a/.github/workflows/filename-check.yml b/.github/workflows/filename-check.yml
index 4f78a107..aa3704fc 100644
--- a/.github/workflows/filename-check.yml
+++ b/.github/workflows/filename-check.yml
@@ -16,7 +16,7 @@ jobs:
         echo "Hello"
         all_files=$(find doc/manual -type f)
         echo $all_files
-        files_with_caps=$(find doc/manual -type f | grep -E '[A-Z]')
+        files_with_caps=$(find doc/manual -type f | grep -E "[A-Z]")
         echo $files_with_caps
 #        if [ ! -z "$files_with_caps" ]; then
 #          echo "Files with capital letters:"