diff --git a/integrationtest/v5/account/account_test.go b/integrationtest/v5/account/account_test.go
index 0116146..e364a66 100644
--- a/integrationtest/v5/account/account_test.go
+++ b/integrationtest/v5/account/account_test.go
@@ -12,7 +12,7 @@ import (
 
 func TestGetWalletBalance(t *testing.T) {
 	client := bybit.NewTestClient().WithAuthFromEnv()
-	res, err := client.V5().Account().GetWalletBalance(bybit.UnifiedAccount, "")
+	res, err := client.V5().Account().GetWalletBalance(bybit.AccountTypeUnified, nil)
 	require.NoError(t, err)
 	{
 		goldenFilename := "./testdata/v5-account-get-wallet-balance.json"
diff --git a/v5_account_service.go b/v5_account_service.go
index 7effb07..200177c 100644
--- a/v5_account_service.go
+++ b/v5_account_service.go
@@ -2,11 +2,12 @@ package bybit
 
 import (
 	"net/url"
+	"strings"
 )
 
 // V5AccountServiceI :
 type V5AccountServiceI interface {
-	GetWalletBalance(AccountType, string) (*V5WalletBalanceResponse, error)
+	GetWalletBalance(AccountType, []Coin) (*V5WalletBalanceResponse, error)
 }
 
 // V5AccountService :
@@ -64,15 +65,19 @@ type V5WalletBalanceList struct {
 // coin:
 // If not passed, it returns non-zero asset info
 // You can pass multiple coins to query, separated by comma. "USDT,USDC".
-func (s *V5AccountService) GetWalletBalance(at AccountType, coin string) (*V5WalletBalanceResponse, error) {
+func (s *V5AccountService) GetWalletBalance(at AccountType, coins []Coin) (*V5WalletBalanceResponse, error) {
 	var (
 		res   V5WalletBalanceResponse
 		query = make(url.Values)
 	)
 
 	query.Add("accountType", string(at))
-	if coin != "" {
-		query.Add("coin", coin)
+	if len(coins) > 0 {
+		var coinsStr []string
+		for _, c := range coins {
+			coinsStr = append(coinsStr, string(c))
+		}
+		query.Add("coin", strings.Join(coinsStr, ","))
 	}
 
 	if err := s.client.getV5Privately("/v5/account/wallet-balance", query, &res); err != nil {
diff --git a/v5_account_service_test.go b/v5_account_service_test.go
index e84d813..46c57fb 100644
--- a/v5_account_service_test.go
+++ b/v5_account_service_test.go
@@ -62,7 +62,7 @@ func TestV5Account_GetWalletBalance(t *testing.T) {
 			WithBaseURL(server.URL).
 			WithAuth("test", "test")
 
-		resp, err := client.V5().Account().GetWalletBalance(UnifiedAccount, "")
+		resp, err := client.V5().Account().GetWalletBalance(AccountTypeUnified, nil)
 		require.NoError(t, err)
 
 		require.NotNil(t, resp)
diff --git a/v5_enum.go b/v5_enum.go
index 75d0d12..57f56d8 100644
--- a/v5_enum.go
+++ b/v5_enum.go
@@ -4,8 +4,8 @@ package bybit
 type AccountType string
 
 const (
-	UnifiedAccount AccountType = "UNIFIED"
-	NormalAccount  AccountType = "CONTRACT"
+	AccountTypeUnified AccountType = "UNIFIED"
+	AccountTypeNormal  AccountType = "CONTRACT"
 )
 
 // CategoryV5 :