diff --git a/lib/moment-range.js b/lib/moment-range.js
index 5ef79f1..576b76b 100644
--- a/lib/moment-range.js
+++ b/lib/moment-range.js
@@ -37,6 +37,10 @@ export class DateRange {
 
     this.start = s || s === 0 ? moment(s) : moment(-8640000000000000);
     this.end = e || e === 0 ? moment(e) : moment(8640000000000000);
+
+    if (this.end.isBefore(this.start)) {
+      [this.start, this.end] = [this.end, this.start];
+    }
   }
 
   adjacent(other) {
diff --git a/lib/moment-range_test.js b/lib/moment-range_test.js
index 0ebdb8b..d9770d3 100644
--- a/lib/moment-range_test.js
+++ b/lib/moment-range_test.js
@@ -167,6 +167,15 @@ describe('DateRange', function() {
       expect(r.start.isSame(quarterStart)).to.be(true);
       expect(r.end.isSame(quarterEnd)).to.be(true);
     });
+
+    it('should automatically sort the range start and end date', function() {
+      const a = moment('2005-01-01');
+      const b = moment('2008-12-20');
+      const r = moment.range(b, a);
+
+      expect(r.start.isSame(a)).to.be(true);
+      expect(r.end.isSame(b)).to.be(true);
+    });
   });
 
   describe('#adjacent', function() {