diff --git a/jam-ui/src/helpers/rest.js b/jam-ui/src/helpers/rest.js
index 409be9f27..586ea2a30 100644
--- a/jam-ui/src/helpers/rest.js
+++ b/jam-ui/src/helpers/rest.js
@@ -167,7 +167,8 @@ export const getSessions = () => {
 
 export const getLatencyToUsers = (currentUserId, participantIds) => {
   return new Promise((resolve, reject) => {
-    apiFetch(`/users/${currentUserId}/latencies?user_ids[]=${participantIds}`)
+    const query = participantIds.map(id => `user_ids[]=${id}`).join('&')
+    apiFetch(`/users/${currentUserId}/latencies?${query}`)
     .then(response => resolve(response))
     .catch(error => reject(error))
   })