diff --git a/src/monger/testing.clj b/src/monger/testing.clj
index 2afaec5..8034342 100644
--- a/src/monger/testing.clj
+++ b/src/monger/testing.clj
@@ -41,8 +41,6 @@
 
 (def factories (atom {}))
 (def defaults  (atom {}))
-(def oids      (atom {}))
-
 
 (defn defaults-for
   [f-group & { :as attributes }]
@@ -66,10 +64,4 @@
    (let [doc (apply build f-group f-name (flatten (vec overrides)))
          oid (:_id doc)]
      (assert (mr/ok? (mc/insert f-group doc)))
-     (swap! oids (fn [a]
-                   (assoc-in a [(name f-group) (name f-name)] oid)))
      doc)))
-
-(defn oid-of
-  [f-group f-name]
-  (get-in @oids [(name f-group) (name f-name)]))
diff --git a/test/monger/test/factory_dsl.clj b/test/monger/test/factory_dsl.clj
index d556bc5..d5439a9 100644
--- a/test/monger/test/factory_dsl.clj
+++ b/test/monger/test/factory_dsl.clj
@@ -54,7 +54,6 @@
         doc (seed "domains" "clojure.org" :created-at t)]
     (is (= 1 (mc/count "domains")))
     (is (:_id doc))
-    (is (= (:_id doc) (oid-of "domains" "clojure.org")))
     (is (= t (:created-at doc)))
     (is (= "clojure.org" (:name doc)))
     (is (false? (:ipv6-enabled doc)))))