diff --git a/lib/mongoid/taggable_with_context.rb b/lib/mongoid/taggable_with_context.rb
index f0435a5..87429e6 100644
--- a/lib/mongoid/taggable_with_context.rb
+++ b/lib/mongoid/taggable_with_context.rb
@@ -153,7 +153,7 @@ def convert_string_to_array(str = "", separator = " ")
     end
 
     def convert_array_to_string(ary = [], separator = " ")
-      clean_up_array(ary).join(separator)
+      ary.join(separator)
     end
 
     def clean_up_array(ary = [])