diff --git a/lib/tbd.js b/lib/tbd.js
index 05f3389..69f3b08 100644
--- a/lib/tbd.js
+++ b/lib/tbd.js
@@ -162,26 +162,27 @@
                 start = new Date(start.getFullYear(), start.getMonth(), start.getDate(), start.getHours(), start.getMinutes(), start.getSeconds(), start.getMilliseconds());
                 switch(dateType) {
                     case 'y':
-                        start.setFullYear(start.getFullYear() + inc++);
+                        start.setFullYear(start.getFullYear() + inc);
                         break;
                     case 'M':
-                        start.setMonth(start.getMonth() + inc++);
+                        start.setMonth(start.getMonth() + inc);
                         break;
                     case 'd':
-                        start.setDate(start.getDate() + inc++);
+                        start.setDate(start.getDate() + inc);
                         break;
                     case 'h':
-                        start.setHours(start.getHours() + inc++);
+                        start.setHours(start.getHours() + inc);
                         break;
                     case 'm':
-                        start.setMinutes(start.getMinutes() + inc++);
+                        start.setMinutes(start.getMinutes() + inc);
                         break;
                     case 's':
-                        start.setSeconds(start.getSeconds() + inc++);
+                        start.setSeconds(start.getSeconds() + inc);
                         break;
                     default:
                         throw 'The value ' + dateType + ' is not an understood date part';
                 }
+                inc = inc || 1;
                 return start;
             };
         } else {
diff --git a/tests/until-sequential-spec.js b/tests/until-sequential-spec.js
index 155335c..bc7c9d2 100644
--- a/tests/until-sequential-spec.js
+++ b/tests/until-sequential-spec.js
@@ -108,4 +108,15 @@ describe('tbd-util-sequantial', function() {
         expect(data[0].foo.getSeconds()).toEqual(start.getSeconds());
         expect(data[1].foo.getSeconds()).toEqual(start.getSeconds() + 1);
     });
+    
+    it('should know that going past the end of a month rolls over to a new month', function () {
+        var start = new Date(2011, 2, 1),
+            data = tbd.from({})
+                    .prop('foo').use(tbd.utils.sequential(start, 'd'))
+                    .make(30);
+
+        //just of note you have to +1 the month as it returns a 0-based month index
+        expect(data[29].foo.getMonth() + 1).not.toEqual(2);
+        expect(data[29].foo.getMonth() + 1).toEqual(3);
+    });
 });
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