diff --git a/web3.js/src/connection.js b/web3.js/src/connection.js
index 4843698ae..b6d161886 100644
--- a/web3.js/src/connection.js
+++ b/web3.js/src/connection.js
@@ -325,7 +325,7 @@ type LeaderSchedule = {
 
 const GetLeaderScheduleResult = struct.record([
   'string',
-  struct.array(['number']),
+  'any', // validating struct.array(['number']) is extremely slow
 ]);
 
 /**