diff --git a/x/oracle/keeper/band_oracle.go b/x/oracle/keeper/band_oracle.go
index 17e3783..ef31a0e 100644
--- a/x/oracle/keeper/band_oracle.go
+++ b/x/oracle/keeper/band_oracle.go
@@ -3,6 +3,7 @@ package keeper
 import (
 	"context"
 	"fmt"
+	"slices"
 	"strconv"
 	"time"
 
@@ -269,11 +270,15 @@ func (k Keeper) AddNewSymbolToBandOracleRequest(ctx context.Context, symbol stri
 	// check if new symbol's oracle script id is existing
 	for _, req := range allBandOracleRequests {
 		if req.OracleScriptId == oracleScriptId {
+			if slices.Contains(req.Symbols, symbol) {
+				return errorsmod.Wrapf(types.ErrSetBandOracleRequest, "symbol %s already registered", symbol)
+			}
+
 			req.Symbols = append(req.Symbols, symbol)
-			err := k.SetBandOracleRequest(ctx, *req)
-			if err != nil {
+			if err := k.SetBandOracleRequest(ctx, *req); err != nil {
 				return errorsmod.Wrapf(types.ErrSetBandOracleRequest, "can not set symbol %s with oracle script id %v", symbol, oracleScriptId)
 			}
+
 			return nil
 		}
 	}
diff --git a/x/oracle/keeper/band_oracle_test.go b/x/oracle/keeper/band_oracle_test.go
index b6dcdcc..3a19b8e 100644
--- a/x/oracle/keeper/band_oracle_test.go
+++ b/x/oracle/keeper/band_oracle_test.go
@@ -362,8 +362,8 @@ func TestProcessBandOraclePrices(t *testing.T) {
 			},
 			oracleOutput: types.BandOutput{
 				Responses: []types.Response{
-					{Symbol: "ATOM", ResponseCode: 0, Rate: 100 * types.BandPriceMultiplier},  
-					{Symbol: "BTC", ResponseCode: 0, Rate: 50000 * types.BandPriceMultiplier}, 
+					{Symbol: "ATOM", ResponseCode: 0, Rate: 100 * types.BandPriceMultiplier},
+					{Symbol: "BTC", ResponseCode: 0, Rate: 50000 * types.BandPriceMultiplier},
 				},
 			},
 			expectedError: false,
@@ -421,3 +421,34 @@ func TestProcessBandOraclePrices(t *testing.T) {
 		})
 	}
 }
+
+func (s *KeeperTestSuite) TestAddNewSymbolToBandOracleRequest() {
+	s.SetupTest()
+	var (
+		symbolScript = map[int64][]string{
+			42: {"ATOM", "OSMO"},
+			52: {"USD", "EUR", "JPY"},
+		}
+
+		setSymbolScript = func() {
+			for oracleScriptId, symbols := range symbolScript {
+				for _, symbol := range symbols {
+					err := s.k.AddNewSymbolToBandOracleRequest(s.Ctx, symbol, oracleScriptId)
+					s.Require().NoError(err)
+				}
+			}
+		}
+	)
+
+	setSymbolScript()
+	// duplicate AddNewSymbolToBandOracleRequest test
+	setSymbolScript()
+
+	err := s.k.IteratorOracleRequests(s.Ctx, func(bandOracleRequest types.BandOracleRequest) bool {
+		expSymbols, ok := symbolScript[bandOracleRequest.OracleScriptId]
+		s.Require().True(ok)
+		s.Require().Equal(len(expSymbols), len(bandOracleRequest.Symbols))
+		return false
+	})
+	s.Require().NoError(err)
+}
diff --git a/x/oracle/keeper/keeper_test.go b/x/oracle/keeper/keeper_test.go
index 0148e6e..2ce7edb 100644
--- a/x/oracle/keeper/keeper_test.go
+++ b/x/oracle/keeper/keeper_test.go
@@ -2,14 +2,22 @@ package keeper_test
 
 import (
 	"testing"
-	testifysuite "github.com/stretchr/testify/suite"
+
 	apptesting "github.com/onomyprotocol/reserve/app/apptesting"
+	"github.com/onomyprotocol/reserve/x/oracle/keeper"
+	testifysuite "github.com/stretchr/testify/suite"
 )
 
 type KeeperTestSuite struct {
 	apptesting.KeeperTestHelper
+	k keeper.Keeper
 }
 
 func TestKeeperTestSuite(t *testing.T) {
 	testifysuite.Run(t, new(KeeperTestSuite))
-}
\ No newline at end of file
+}
+
+func (s *KeeperTestSuite) SetupTest() {
+	s.Setup()
+	s.k = s.App.OracleKeeper
+}