diff --git a/moment-range/moment-range-tests.ts b/moment-range/moment-range-tests.ts
index 0ef37a6817..7940e58506 100644
--- a/moment-range/moment-range-tests.ts
+++ b/moment-range/moment-range-tests.ts
@@ -5,7 +5,7 @@ var range2: moment.Range = moment.range(moment("2011-04-15", "YYYY-MM-DD"), mome
 var range3: moment.Range = moment.range([moment("2011-04-15", "YYYY-MM-DD"), moment("2011-11-27", "YYYY-MM-DD")]);
 var range4: moment.Range = moment.range("2015-01-17T09:50:04+00:00/2015-04-17T08:29:55+00:00");
 
-var date: moment.Moment = moment(2012, 4, 15);
+var date: moment.Moment = moment('2012-05- 15');
 
 var res1: boolean = range.contains(date);
 var res2: boolean = range.contains(date, false);
diff --git a/moment-range/moment-range.d.ts b/moment-range/moment-range.d.ts
index 63771f4363..5c32bd88f8 100644
--- a/moment-range/moment-range.d.ts
+++ b/moment-range/moment-range.d.ts
@@ -27,8 +27,8 @@ declare module moment {
         start: Moment;
         end: Moment;
 
-        contains (other: Date, exclusive = false): boolean;
-        contains (other: Moment, exclusive = false): boolean;
+        contains (other: Date, exclusive?: boolean): boolean;
+        contains (other: Moment, exclusive?: boolean): boolean;
 
         overlaps (range: Range): boolean;
 
@@ -38,8 +38,8 @@ declare module moment {
 
         subtract (other: Range): Range[];
 
-        by (range: string, hollaback: (current: Moment) => void, exclusive = false);
-        by (range: Range, hollaback: (current: Moment) => void, exclusive = false);
+        by (range: string, hollaback: (current: Moment) => void, exclusive?: boolean): void;
+        by (range: Range, hollaback: (current: Moment) => void, exclusive?: boolean): void;
 
         isSame (other: Range): boolean;