diff --git a/DefaultTabBar.js b/DefaultTabBar.js
index 265c9f45..7dcf130f 100644
--- a/DefaultTabBar.js
+++ b/DefaultTabBar.js
@@ -37,6 +37,7 @@ const DefaultTabBar = React.createClass({
     const fontWeight = isTabActive ? 'bold' : 'normal';
 
     return <Button
+      style={{flex: 1}}
       key={name}
       accessible={true}
       accessibilityLabel={name}