diff --git a/lib/avo/fields/belongs_to_field.rb b/lib/avo/fields/belongs_to_field.rb
index f2b950d82..4dd4a904a 100644
--- a/lib/avo/fields/belongs_to_field.rb
+++ b/lib/avo/fields/belongs_to_field.rb
@@ -194,7 +194,7 @@ def to_permitted_param
           return [:"#{polymorphic_as}_type", :"#{polymorphic_as}_id"]
         end
 
-        foreign_key.is_a?(Array) ? foreign_key.map(&:to_sym) : foreign_key.to_sym                                                                                                                                                       
+        foreign_key.is_a?(Array) ? foreign_key.map(&:to_sym) : foreign_key.to_sym
       end
 
       def fill_field(record, key, value, params)