diff --git a/backend/src/middleware/auth/checks/submission-checks.ts b/backend/src/middleware/auth/checks/submission-checks.ts
index 6c7969e0..bd895aec 100644
--- a/backend/src/middleware/auth/checks/submission-checks.ts
+++ b/backend/src/middleware/auth/checks/submission-checks.ts
@@ -40,6 +40,6 @@ export const onlyAllowIfHasAccessToSubmissionFromParams = authorize(async (auth:
         return cls.teachers.map(mapToUsername).includes(auth.username);
     }
 
-    const group = await fetchGroup(classId as string, +(assignmentId as string), +(groupId as string));
+    const group = await fetchGroup(classId as string, Number(assignmentId as string), Number(groupId as string));
     return group.members.map(mapToUsername).includes(auth.username);
 });
\ No newline at end of file
diff --git a/backend/src/routes/submissions.ts b/backend/src/routes/submissions.ts
index 7dfa80f3..31f71381 100644
--- a/backend/src/routes/submissions.ts
+++ b/backend/src/routes/submissions.ts
@@ -1,7 +1,7 @@
 import express from 'express';
 import { createSubmissionHandler, deleteSubmissionHandler, getSubmissionHandler, getSubmissionsHandler } from '../controllers/submissions.js';
 import { onlyAllowIfHasAccessToSubmission, onlyAllowIfHasAccessToSubmissionFromParams, onlyAllowSubmitter } from '../middleware/auth/checks/submission-checks.js';
-import { adminOnly, studentsOnly } from '../middleware/auth/checks/auth-checks.js';
+import { studentsOnly } from '../middleware/auth/checks/auth-checks.js';
 const router = express.Router({ mergeParams: true });
 
 router.get('/', onlyAllowIfHasAccessToSubmissionFromParams, getSubmissionsHandler);