diff --git a/server/utils/helcim.js b/server/utils/helcim.js
index 6cb068f..a0a28c8 100644
--- a/server/utils/helcim.js
+++ b/server/utils/helcim.js
@@ -99,7 +99,7 @@ export const cancelHelcimSubscription = (id) =>
 export const updateHelcimSubscription = (id, payload) =>
   helcimFetch('/subscriptions', {
     method: 'PATCH',
-    body: { subscriptions: [{ id: String(id), ...payload }] },
+    body: { subscriptions: [{ id: Number(id), ...payload }] },
     errorMessage: 'Subscription update failed'
   })