diff --git a/src/date-picker/day-button.jsx b/src/date-picker/day-button.jsx
index 0505a67bd3c4ac..1bfa612435f8a9 100644
--- a/src/date-picker/day-button.jsx
+++ b/src/date-picker/day-button.jsx
@@ -52,6 +52,7 @@ let DayButton = React.createClass({
         position: 'relative',
         float: 'left',
         width: 36,
+        margin: '0px',
         padding: '4px 2px',
       },