diff --git a/services/wallet-service/internal/storage/mysql/coin_seller_ledger.go b/services/wallet-service/internal/storage/mysql/coin_seller_ledger.go
index 1d880009..afb3b358 100644
--- a/services/wallet-service/internal/storage/mysql/coin_seller_ledger.go
+++ b/services/wallet-service/internal/storage/mysql/coin_seller_ledger.go
@@ -57,7 +57,7 @@ func (r *Repository) AdminCreditCoinSellerStock(ctx context.Context, command led
 	if availableDelta < 0 && account.AvailableAmount < command.CoinAmount {
 		return ledger.CoinSellerStockCreditReceipt{}, xerr.New(xerr.InsufficientBalance, "insufficient balance")
 	}
-	balanceAfter, err := checkedAdd(account.AvailableAmount, availableDelta)
+	balanceAfter, err := checkedAddDelta(account.AvailableAmount, availableDelta)
 	if err != nil {
 		return ledger.CoinSellerStockCreditReceipt{}, err
 	}
diff --git a/services/wallet-service/internal/storage/mysql/utils.go b/services/wallet-service/internal/storage/mysql/utils.go
index 9ea354e0..e69cf32b 100644
--- a/services/wallet-service/internal/storage/mysql/utils.go
+++ b/services/wallet-service/internal/storage/mysql/utils.go
@@ -49,6 +49,13 @@ func checkedAdd(left int64, right int64) (int64, error) {
 	return left + right, nil
 }
 
+func checkedAddDelta(left int64, right int64) (int64, error) {
+	if (right > 0 && left > math.MaxInt64-right) || (right < 0 && left < math.MinInt64-right) {
+		return 0, xerr.New(xerr.CoinSellerStockAmountInvalid, "coin amount overflow")
+	}
+	return left + right, nil
+}
+
 func stableHash(value string) string {
 	sum := sha256.Sum256([]byte(value))
 	return hex.EncodeToString(sum[:])