diff --git a/src/Calendar.js b/src/Calendar.js
index d321572..9e131d7 100644
--- a/src/Calendar.js
+++ b/src/Calendar.js
@@ -131,9 +131,9 @@ export default class Calendar extends React.Component {
 			}));
 
 			if (isFutureDate) {
-				monthIterator.setMonth(monthIterator.getMonth() + 1);
+				monthIterator.setMonth(monthIterator.getMonth() + 1, 1);
 			} else {
-				monthIterator.setMonth(monthIterator.getMonth() - 1);
+				monthIterator.setMonth(monthIterator.getMonth() - 1, 1);
 			}
 		}