diff --git a/frontend/src/api/fetchCourse.ts b/frontend/src/api/fetchCourse.ts
index b29fc43..933559e 100644
--- a/frontend/src/api/fetchCourse.ts
+++ b/frontend/src/api/fetchCourse.ts
@@ -70,7 +70,7 @@ export async function fetchModulesByCourseAndSemester(
 }
 
 export async function fetchAllModules(): Promise<Module[]> {
-  let modules: Module[] = [];
+  const modules: Module[] = [];
   await fetch("/api/modules")
     .then((response) => {
       return response.json() as Promise<Module[]>;