diff --git a/src/api/promocode.ts b/src/api/promocode.ts
index 1733d9d..9371b79 100644
--- a/src/api/promocode.ts
+++ b/src/api/promocode.ts
@@ -15,6 +15,7 @@ export async function activatePromocode(promocode: string) {
         }>({
             url: apiUrl + "/activate",
             method: "POST",
+            contentType: true,
             body: {
                 codeword: promocode,
             }