diff --git a/core/mapping/marshaler.go b/core/mapping/marshaler.go
index 797cbdf26..b2c89b7bf 100644
--- a/core/mapping/marshaler.go
+++ b/core/mapping/marshaler.go
@@ -3,6 +3,7 @@ package mapping
 import (
 	"fmt"
 	"reflect"
+	"slices"
 	"strings"
 )
 
@@ -152,18 +153,10 @@ func validateOptional(field reflect.StructField, value reflect.Value) error {
 }
 
 func validateOptions(value reflect.Value, opt *fieldOptions) error {
-	var found bool
 	val := fmt.Sprint(value.Interface())
-	for i := range opt.Options {
-		if opt.Options[i] == val {
-			found = true
-			break
-		}
-	}
-	if !found {
+	if !slices.Contains(opt.Options, val) {
 		return fmt.Errorf("field %q not in options", val)
 	}
-
 	return nil
 }