1 files changed, 4 insertions, 0 deletions
diff --git a/lib/arel/engines/sql/core_extensions/nil_class.rb b/lib/arel/engines/sql/core_extensions/nil_class.rb
index c3dbc8cd76..3f70677ba6 100644
--- a/lib/arel/engines/sql/core_extensions/nil_class.rb
+++ b/lib/arel/engines/sql/core_extensions/nil_class.rb
@@ -5,6 +5,10 @@ module Arel
         'IS'
       end
 
+      def not_predicate_sql
+        'IS NOT'
+      end
+
       NilClass.send(:include, self)
     end
   end