diff --git a/config/mongoid.example.yml b/config/mongoid.example.yml
index f85c755..67496d6 100644
--- a/config/mongoid.example.yml
+++ b/config/mongoid.example.yml
@@ -9,7 +9,6 @@
 
 defaults: &defaults
   host: localhost
-  identity_map_enabled: true
   # slaves:
   #   - host: slave1.local
   #     port: 27018
diff --git a/config/mongoid.mongohq.yml b/config/mongoid.mongohq.yml
index c3a38cb..aab95f2 100644
--- a/config/mongoid.mongohq.yml
+++ b/config/mongoid.mongohq.yml
@@ -6,4 +6,3 @@
 
 production:
   uri: <%= ENV['MONGOHQ_URL'] %>
-  identity_map_enabled: true
--
libgit2 0.21.2