diff --git a/src/clojure/monger/operators.clj b/src/clojure/monger/operators.clj
index a4311af..baea9c0 100644
--- a/src/clojure/monger/operators.clj
+++ b/src/clojure/monger/operators.clj
@@ -265,7 +265,7 @@
 (defoperator $add)
 (defoperator $divide)
 (defoperator $multiply)
-(defoperator $substract)
+(defoperator $subtract)
 
 (defoperator $strcasecmp)
 (defoperator $substr)