diff --git a/src/clojure/monger/operators.clj b/src/clojure/monger/operators.clj
index 0c19097..3b3794b 100644
--- a/src/clojure/monger/operators.clj
+++ b/src/clojure/monger/operators.clj
@@ -220,6 +220,7 @@
 (defoperator $minute)
 (defoperator $month)
 (defoperator $second)
+(defoperator $millisecond)
 (defoperator $week)
 (defoperator $year)
 (defoperator $isoDate)