diff --git a/web3.js/src/connection.ts b/web3.js/src/connection.ts
index 254d00d9d2e04f..0c92c0fffad071 100644
--- a/web3.js/src/connection.ts
+++ b/web3.js/src/connection.ts
@@ -782,7 +782,7 @@ const GetInflationRewardResult = jsonRpcResult(
         effectiveSlot: number(),
         amount: number(),
         postBalance: number(),
-        commission: optional(nullable(number())),
+        commission: nullable(number()),
       }),
     ),
   ),
@@ -2307,7 +2307,7 @@ const RewardsResult = pick({
   lamports: number(),
   postBalance: nullable(number()),
   rewardType: nullable(string()),
-  commission: optional(nullable(number())),
+  commission: nullable(number()),
 });
 
 /**