diff --git a/core/vm/gas_table.go b/core/vm/gas_table.go
index 7319060e27..d8d5127be5 100644
--- a/core/vm/gas_table.go
+++ b/core/vm/gas_table.go
@@ -380,7 +380,7 @@ func gasExp(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem
 		gas      = expByteLen * gt.ExpByte // no overflow check required. Max is 256 * ExpByte gas
 		overflow bool
 	)
-	if gas, overflow = math.SafeAdd(gas, GasSlowStep); overflow {
+	if gas, overflow = math.SafeAdd(gas, params.ExpGas); overflow {
 		return 0, errGasUintOverflow
 	}
 	return gas, nil