diff --git a/light/txpool.go b/light/txpool.go
index 5a122089d0..5ab9ffdf5b 100644
--- a/light/txpool.go
+++ b/light/txpool.go
@@ -392,7 +392,7 @@ func (pool *TxPool) validateTx(ctx context.Context, tx *types.Transaction) error
 		selfPayAmount = new(big.Int).Add(selfPayAmount, tx.Value())
 		sponsorBalance := currentState.GetBalance(metaTxParams.GasFeeSponsor)
 		if sponsorBalance.Cmp(sponsorAmount) < 0 {
-			return core.ErrInsufficientFunds
+			return types.ErrSponsorBalanceNotEnough
 		}
 		userBalance := currentState.GetBalance(from)
 		if userBalance.Cmp(selfPayAmount) < 0 {