diff --git a/src/backend/database/routes/users.ts b/src/backend/database/routes/users.ts
index c2b2ac03..38547cca 100644
--- a/src/backend/database/routes/users.ts
+++ b/src/backend/database/routes/users.ts
@@ -587,6 +587,7 @@ router.get("/oidc/callback", async (req, res) => {
       method: "POST",
       headers: {
         "Content-Type": "application/x-www-form-urlencoded",
+        Accept: "application/json",
       },
       body: new URLSearchParams({
         grant_type: "authorization_code",