diff --git a/react-big-calendar/index.d.ts b/react-big-calendar/index.d.ts
index c55a3c126c..75508cae5e 100644
--- a/react-big-calendar/index.d.ts
+++ b/react-big-calendar/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for react-big-calendar 0.11
+// Type definitions for react-big-calendar 0.12.3
 // Project: https://github.com/intljusticemission/react-big-calendar
 // Definitions by: Piotr Witek <http://piotrwitek.github.io>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -26,10 +26,10 @@ declare module 'react-big-calendar' {
         step?: number;
         rtl?: boolean;
         eventPropGetter?: (event: Object, start: stringOrDate, end: stringOrDate, isSelected: boolean) => void;
-        titleAccessor?: string;
-        allDayAccessor?: boolean;
-        startAccessor?: stringOrDate;
-        endAccessor?: stringOrDate;
+        titleAccessor?: string | ((row: Object) => string);
+        allDayAccessor?: string | ((row: Object) => boolean);
+        startAccessor?: string | ((row: Object) => Date);
+        endAccessor?: string | ((row: Object) => Date);
         min?: stringOrDate;
         max?: stringOrDate;
         scrollToTime?: stringOrDate;
@@ -38,6 +38,8 @@ declare module 'react-big-calendar' {
         messages?: Object;
         timeslots?: number;
         defaultView?: string;
+        className?: string;
+        elementProps?: React.HTMLAttributes<HTMLElement>;
     }
 
     class BigCalendar extends React.Component<BigCalendarProps, {}> {
diff --git a/react-big-calendar/react-big-calendar-tests.tsx b/react-big-calendar/react-big-calendar-tests.tsx
index 9e492462ae..2ca939c0a6 100644
--- a/react-big-calendar/react-big-calendar-tests.tsx
+++ b/react-big-calendar/react-big-calendar-tests.tsx
@@ -58,10 +58,10 @@ const FullAPIExample = React.createClass({
                 step={20}
                 rtl={true}
                 eventPropGetter={(event, start, end, isSelected) => { } }
-                titleAccessor={'string'}
-                allDayAccessor={true}
-                startAccessor={new Date()}
-                endAccessor={new Date()}
+                titleAccessor={'title'}
+                allDayAccessor={(row:any) => !!row.allDay}
+                startAccessor={'start'}
+                endAccessor={(row:any) => row.end || row.start}
                 min={new Date()}
                 max={new Date()}
                 scrollToTime={new Date()}
@@ -70,6 +70,8 @@ const FullAPIExample = React.createClass({
                 messages={{}}
                 timeslots={24}
                 defaultView={'month'}
+                className={'my-calendar'}
+                elementProps={{id: 'myCalendar'}}
             />
         );
     }