diff --git a/grading-gitlab-ci.yml b/grading-gitlab-ci.yml
index 16b546540b00dbe06685fd6c6f28506f9c42d7f9..ff0be433d74fee6e1b3eb2ae94232281f287c2a3 100644
--- a/grading-gitlab-ci.yml
+++ b/grading-gitlab-ci.yml
@@ -66,4 +66,4 @@ grade:
   script:
     - cd /grader
     - /grader/grade
-    - grep -q /shared/feedback.json '"fractionalScore": 1.00'
+    - "grep -q /shared/feedback.json '\"fractionalScore\": 1.00'"