diff --git a/lib/profanity_filter.rb b/lib/profanity_filter.rb
index 302c03b..9dcea7f 100644
--- a/lib/profanity_filter.rb
+++ b/lib/profanity_filter.rb
@@ -87,4 +87,4 @@ def replacement(word)
   end
 end
 
-ActiveRecord::Base.send(:include, ProfanityFilter) if defined?(ActiveRecord)
+ActiveRecord::Base.send(:include, ProfanityFilter) if defined?(ActiveRecord::Base)