diff --git a/assertion-error/assertion-error-tests.d.ts b/assertion-error/assertion-error-tests.d.ts
new file mode 100644
index 0000000000..b2a33a307a
--- /dev/null
+++ b/assertion-error/assertion-error-tests.d.ts
@@ -0,0 +1,15 @@
+/// <reference path="assertion-error.d.ts" />
+
+import AssertionError = require('assertion-error');
+
+var e: AssertionError;
+var str: string;
+
+function foo () {
+
+}
+
+e = new AssertionError(str);
+e = new AssertionError(str, {a:1, b2});
+e = new AssertionError(str, {a:1, b2}, foo);
+
diff --git a/assertion-error/assertion-error.d.ts b/assertion-error/assertion-error.d.ts
new file mode 100644
index 0000000000..5b63d63cf2
--- /dev/null
+++ b/assertion-error/assertion-error.d.ts
@@ -0,0 +1,15 @@
+// Type definitions for assertion-error 1.0 0
+// Project: https://github.com/chaijs/assertion-error
+// Definitions by: Bart van der Schoor <https://github.com/Bartvds>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'assertion-error' {
+	class AssertionError implements Error {
+		constructor(message: string, props?: any, ssf?: Function);
+		name: string;
+		message: string;
+		showDiff: boolean;
+		stack: string;
+	}
+	export = AssertionError;
+}