diff --git a/lib/active_record/connection_adapters/redshift_adapter.rb b/lib/active_record/connection_adapters/redshift_adapter.rb
index 42219ea..bf2b736 100644
--- a/lib/active_record/connection_adapters/redshift_adapter.rb
+++ b/lib/active_record/connection_adapters/redshift_adapter.rb
@@ -144,7 +144,7 @@ def initialize_type_map(m = type_map) # :nodoc:
         m.alias_type 'name', 'varchar'
         m.alias_type 'bpchar', 'varchar'
         m.register_type 'bool', Type::Boolean.new
-        m.alias_type 'timestamptz', 'timestamp'
+        m.register_type 'timestamptz', Type::Time.new
         m.register_type 'date', Type::Date.new
 
         m.register_type 'timestamp' do |_, _, sql_type|