diff --git a/zephyr/tests/frontend/common.js b/zephyr/tests/frontend/common.js
index cc16c03cbd..29308a2fcb 100644
--- a/zephyr/tests/frontend/common.js
+++ b/zephyr/tests/frontend/common.js
@@ -158,9 +158,9 @@ exports.send_many = function (msgs) {
 
 // Wait to receive queued messages.
 exports.wait_for_receive = function (step) {
-    // Wait until the last send or get_events result was more than 300 ms ago.
+    // Wait until the last send or get_events result was more than 500 ms ago.
     casper.waitFor(function () {
-        return (timestamp() - last_send_or_update) > 300;
+        return (timestamp() - last_send_or_update) > 500;
     }, step);
 };