diff --git a/lib/mobility/backends/sequel/pg_hash.rb b/lib/mobility/backends/sequel/pg_hash.rb
index 0d879fde2..fd7787fb4 100644
--- a/lib/mobility/backends/sequel/pg_hash.rb
+++ b/lib/mobility/backends/sequel/pg_hash.rb
@@ -3,6 +3,7 @@
 require "mobility/backends/sequel"
 require "mobility/backends/hash_valued"
 require "mobility/sequel/column_changes"
+require "mobility/sequel/hash_initializer"
 
 module Mobility
   module Backends