diff --git a/.travis.yml b/.travis.yml
index 1cd9e35a9..fc7b5e6a5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ python:
 install: 
   - "sudo apt-get -qq install libfreetype6-dev liblcms2-dev libwebp-dev python-qt4 ghostscript libffi-dev"
   - "pip install cffi"
-  - "apt-get install python-tk"
+  - "sudo apt-get install python-tk"
 
 
 script: