diff --git a/src/main/SubscriptionDefinition.js b/src/main/SubscriptionDefinition.js
index 31fa801..ed6e56a 100644
--- a/src/main/SubscriptionDefinition.js
+++ b/src/main/SubscriptionDefinition.js
@@ -133,7 +133,7 @@ SubscriptionDefinition.prototype = {
 		return this;
 	},
 
-	subscribe: function(callbacl) {
+	subscribe: function(callback) {
 		this.callback = callback;
 		return this;
 	}