diff --git a/backend/src/controllers/students.ts b/backend/src/controllers/students.ts
index 229cff7e..e4c49683 100644
--- a/backend/src/controllers/students.ts
+++ b/backend/src/controllers/students.ts
@@ -113,7 +113,7 @@ export async function createStudentRequestHandler(req: Request, res: Response):
     const classId = req.body.classId;
     requireFields({ username, classId });
 
-    const request = await createClassJoinRequest(username, classId);
+    const request = await createClassJoinRequest(username, classId.toUpperCase());
     res.json({ request });
 }