1 files changed, 4 insertions, 2 deletions
diff --git a/lib/arel/relations/utilities/nil.rb b/lib/arel/relations/utilities/nil.rb
index 2b8dc570f8..56cf395d2c 100644
--- a/lib/arel/relations/utilities/nil.rb
+++ b/lib/arel/relations/utilities/nil.rb
@@ -1,8 +1,10 @@
+require 'singleton'
+
 module Arel
   class Nil < Relation
     include Singleton
-    
+
     def table_sql(formatter = nil); '' end
     def name; '' end
   end
-end
-\ No newline at end of file
+end