2 files changed, 7 insertions, 6 deletions
diff --git a/lib/arel/nodes/terminal.rb b/lib/arel/nodes/terminal.rb
new file mode 100644
index 0000000000..c6b4f4e1e2
--- /dev/null
+++ b/lib/arel/nodes/terminal.rb
@@ -0,0 +1,6 @@
+module Arel
+  module Nodes
+    class Distinct < Arel::Nodes::Node
+    end
+  end
+end
diff --git a/lib/arel/nodes/unary.rb b/lib/arel/nodes/unary.rb
index e6e40e6b13..5c4add4792 100644
--- a/lib/arel/nodes/unary.rb
+++ b/lib/arel/nodes/unary.rb
@@ -20,14 +20,9 @@ module Arel
       On
       Top
       Lock
+      DistinctOn
     }.each do |name|
       const_set(name, Class.new(Unary))
     end
-
-    class Distinct < Unary
-      def initialize expr = nil
-        super
-      end
-    end
   end
 end