diff --git a/app/components/grades/grades-chart.tsx b/app/components/grades/grades-chart.tsx
index 4d708b3..e207868 100644
--- a/app/components/grades/grades-chart.tsx
+++ b/app/components/grades/grades-chart.tsx
@@ -5,6 +5,8 @@ import type { Grade, User } from "~/lib/api";
 import { useEffect, useState } from "react";
 import { DateTime } from "luxon";
 
+export const HARDCODED_HIDDEN_SUBJECTS = ["Colles préfet"]
+
 export default function GradesChart({
   grades,
   subjects,
@@ -51,7 +53,7 @@ export default function GradesChart({
             }
           }}
         />
-        {subjects.map((subject, index) => (
+        {subjects.filter((s) => !HARDCODED_HIDDEN_SUBJECTS.includes(s)).map((subject, index) => (
           <Line
             key={index}
             type="linear"