diff --git a/lib/dm-postgres-adapter/adapter.rb b/lib/dm-postgres-adapter/adapter.rb
index 67720c1..f319c89 100644
--- a/lib/dm-postgres-adapter/adapter.rb
+++ b/lib/dm-postgres-adapter/adapter.rb
@@ -7,6 +7,8 @@ module Adapters
     class PostgresAdapter < DataObjectsAdapter
 
       module SQL #:nodoc:
+        IDENTIFIER_MAX_LENGTH = 63
+
         private
 
         # @api private