diff --git a/x/cronos/keeper/precompiles/relayer.go b/x/cronos/keeper/precompiles/relayer.go
index 95eddc0880..136d03dd2d 100644
--- a/x/cronos/keeper/precompiles/relayer.go
+++ b/x/cronos/keeper/precompiles/relayer.go
@@ -64,7 +64,7 @@ func (bc *RelayerContract) Address() common.Address {
 }
 
 // RequiredGas calculates the contract gas use
-// `len(input) * DefaultTxSizeCostPerByte + requiredGasTable[methodPrefix] - intrinsicGas`
+// `max(0, len(input) * DefaultTxSizeCostPerByte + requiredGasTable[methodPrefix] - intrinsicGas)`
 func (bc *RelayerContract) RequiredGas(input []byte) (gas uint64) {
 	if len(input) < prefixSize4Bytes {
 		return 0