diff --git a/knockout.es5/knockout.es5-tests.ts b/knockout.es5/knockout.es5-tests.ts
index c51b9bc9d2..f35ea44b84 100644
--- a/knockout.es5/knockout.es5-tests.ts
+++ b/knockout.es5/knockout.es5-tests.ts
@@ -5,7 +5,7 @@ var empty = {},
     observable = ko.observable(123),
     computed = ko.computed(function () { return observable() + 1; }),
     model = { prop: 100 },
-    notifiedValues = [];
+    notifiedValues: any[] = [];
 
 
 // Basic properties
diff --git a/knockout.es5/knockout.es5.d.ts b/knockout.es5/knockout.es5.d.ts
index 651d7d40f3..6eb210a200 100644
--- a/knockout.es5/knockout.es5.d.ts
+++ b/knockout.es5/knockout.es5.d.ts
@@ -19,7 +19,7 @@ interface KnockoutDefinePropertyOptions {
 }
 
 interface Array<T> {
-	remove(item): T[];
+	remove(item: T): T[];
 	removeAll(items: T[]): T[];
 	removeAll(): T[];