diff --git a/params/protocol_params.go b/params/protocol_params.go
index 69e10fa5d9..cf6ee21ddc 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -139,7 +139,7 @@ const (
 
 	MaxCodeSize              = 24576                    // Maximum bytecode to permit for a contract
 	MaxInitCodeSize          = 2 * MaxCodeSize          // Maximum initcode to permit in a creation transaction and create instructions
-	MaxCodeSizeAmsterdam     = 32768                    // Maximum bytecode to permit for a contract post Amsterdam
+	MaxCodeSizeAmsterdam     = 65536                    // Maximum bytecode to permit for a contract post Amsterdam
 	MaxInitCodeSizeAmsterdam = 2 * MaxCodeSizeAmsterdam // Maximum initcode to permit in a creation transaction and create instructions post Amsterdam
 
 	// Precompiled contract gas prices