diff --git a/pikaday/pikaday-tests.ts b/pikaday/pikaday-tests.ts
index 28d0c33c2..78a3b378f 100644
--- a/pikaday/pikaday-tests.ts
+++ b/pikaday/pikaday-tests.ts
@@ -2,6 +2,8 @@
 /// <reference path="../moment/moment.d.ts" />
 /// <reference path="pikaday.d.ts" />
 
+import * as Pikaday from "pikaday";
+
 new Pikaday({field: document.getElementById('datepicker')});
 new Pikaday({field: $('#datepicker')[0]});
 
@@ -46,7 +48,7 @@ new Pikaday({field: $('#datepicker')[0]});
 })();
 
 (() => {
-    var i18n:PikadayI18nConfig = {
+    var i18n: Pikaday.PikadayI18nConfig = {
         previousMonth: 'Previous Month',
         nextMonth: 'Next Month',
         months: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
diff --git a/pikaday/pikaday.d.ts b/pikaday/pikaday.d.ts
index 21a112b8e..a0f1ab58b 100644
--- a/pikaday/pikaday.d.ts
+++ b/pikaday/pikaday.d.ts
@@ -5,48 +5,10 @@
 
 /// <reference path="../moment/moment.d.ts" />
 
-interface PikadayI18nConfig {
-    previousMonth: string;
-    nextMonth: string;
-    months: string[];
-    weekdays: string[];
-    weekdaysShort: string[];
-}
-
-interface PikadayOptions {
-    field?: HTMLElement;
-    format?: string;
-    trigger?: HTMLElement;
-    bound?: boolean;
-    position?: string;
-    reposition?: boolean;
-    container?: HTMLElement;
-    defaultDate?: Date;
-    setDefaultDate?: boolean;
-    firstDay?: number;
-    minDate?: Date;
-    maxDate?: Date;
-    disableWeekends?: boolean;
-    disableDayFn?: (date:Date) => boolean;
-    yearRange?: number[];
-    showWeekNumber?: boolean;
-    isRTL?: boolean;
-    i18n?: PikadayI18nConfig;
-    yearSuffix?: string;
-    showMonthAfterYear?: boolean;
-    numberOfMonths?: number;
-    mainCalendar?: string;
-    theme?: string;
-    onSelect?: (date:Date) => void;
-    onOpen?: () => void;
-    onClose?: () => void;
-    onDraw?: () => void;
-}
-
 declare class Pikaday {
     el:HTMLElement;
 
-    constructor(options:PikadayOptions);
+    constructor(options: Pikaday.PikadayOptions);
 
     toString():string;
     toString(format:string):string;
@@ -87,3 +49,48 @@ declare class Pikaday {
 
     destroy():void;
 }
+
+// merge the Pikaday class declaration with a module
+declare module Pikaday {
+    interface PikadayI18nConfig {
+        previousMonth: string;
+        nextMonth: string;
+        months: string[];
+        weekdays: string[];
+        weekdaysShort: string[];
+    }
+
+    interface PikadayOptions {
+        field?: HTMLElement;
+        format?: string;
+        trigger?: HTMLElement;
+        bound?: boolean;
+        position?: string;
+        reposition?: boolean;
+        container?: HTMLElement;
+        defaultDate?: Date;
+        setDefaultDate?: boolean;
+        firstDay?: number;
+        minDate?: Date;
+        maxDate?: Date;
+        disableWeekends?: boolean;
+        disableDayFn?: (date:Date) => boolean;
+        yearRange?: number[];
+        showWeekNumber?: boolean;
+        isRTL?: boolean;
+        i18n?: PikadayI18nConfig;
+        yearSuffix?: string;
+        showMonthAfterYear?: boolean;
+        numberOfMonths?: number;
+        mainCalendar?: string;
+        theme?: string;
+        onSelect?: (date:Date) => void;
+        onOpen?: () => void;
+        onClose?: () => void;
+        onDraw?: () => void;
+    }
+}
+
+declare module "pikaday" {
+    export = Pikaday;
+}