Fix category label

Before:
![image](https://cloud.githubusercontent.com/assets/750477/4327835/e629bf1a-3f7d-11e4-92c3-dc327a23ea50.png)

After:
![image](https://cloud.githubusercontent.com/assets/750477/4327820/bb502770-3f7d-11e4-878b-7b202c91f155.png)