diff --git a/web3.js/src/connection.js b/web3.js/src/connection.js
index 5466577ceb..53df89b095 100644
--- a/web3.js/src/connection.js
+++ b/web3.js/src/connection.js
@@ -221,6 +221,8 @@ const GetRecentBlockhash = jsonRpcResult([
   'string',
   struct({
     lamportsPerSignature: 'number',
+    maxLamportsPerSignature: 'number',
+    minLamportsPerSignature: 'number',
     targetLamportsPerSignature: 'number',
     targetSignaturesPerSlot: 'number',
   }),