diff --git a/internal/web3ext/web3ext.go b/internal/web3ext/web3ext.go
index 04fc46cb421d..9ab4686ddbca 100644
--- a/internal/web3ext/web3ext.go
+++ b/internal/web3ext/web3ext.go
@@ -507,8 +507,8 @@ web3._extend({
 		new web3._extend.Method({
 			name: 'estimateGas',
 			call: 'eth_estimateGas',
-			params: 2,
-			inputFormatter: [web3._extend.formatters.inputCallFormatter, web3._extend.formatters.inputBlockNumberFormatter],
+			params: 3,
+			inputFormatter: [web3._extend.formatters.inputCallFormatter, web3._extend.formatters.inputBlockNumberFormatter, null],
 			outputFormatter: web3._extend.utils.toDecimal
 		}),
 		new web3._extend.Method({