diff --git a/oscarapi/serializers/product.py b/oscarapi/serializers/product.py
index 71a25371..9e6a02f7 100644
--- a/oscarapi/serializers/product.py
+++ b/oscarapi/serializers/product.py
@@ -187,7 +187,7 @@ class Meta:
 
 
 class OptionSerializer(OscarHyperlinkedModelSerializer):
-    option_group = AttributeOptionGroupSerializer(required=False, allow_null=True)    
+    option_group = AttributeOptionGroupSerializer(required=False, allow_null=True)
     code = serializers.SlugField()
 
     class Meta: