diff --git a/core/util/phone.go b/core/util/phone.go
index 105993a..37b2025 100644
--- a/core/util/phone.go
+++ b/core/util/phone.go
@@ -179,7 +179,6 @@ func getUzbekistanNationalNumber(phone string, parsedPhone *pn.PhoneNumber) (uin
 }
 
 func getMexicanNationalNumber(parsedPhone *pn.PhoneNumber) (uint64, error) {
-	result := parsedPhone.GetNationalNumber()
 	phoneWithDigit := fmt.Sprintf("1%d", parsedPhone.GetNationalNumber())
 
 	num, err := strconv.Atoi(phoneWithDigit)
@@ -188,8 +187,7 @@ func getMexicanNationalNumber(parsedPhone *pn.PhoneNumber) (uint64, error) {
 		return 0, err
 	}
 
-	result = uint64(num)
-	return result, nil
+	return uint64(num), nil //nolint:gosec
 }
 
 func getCountryCode(phone string) string {
diff --git a/core/util/phone_test.go b/core/util/phone_test.go
index e9d13b4..9c00c9c 100644
--- a/core/util/phone_test.go
+++ b/core/util/phone_test.go
@@ -1,9 +1,10 @@
 package util
 
 import (
-	"github.com/stretchr/testify/require"
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/stretchr/testify/assert"
 )
 
@@ -119,7 +120,7 @@ func TestFormatNumberForWA(t *testing.T) {
 
 	for orig, expected := range numbers {
 		actual, err := FormatNumberForWA(orig)
-		assert.NoError(t, err)
-		assert.Equal(t, expected, actual)
+		require.NoError(t, err)
+		require.Equal(t, expected, actual)
 	}
 }