diff --git a/.travis.yml b/.travis.yml
index 5f01f223..09497db6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,7 +27,7 @@ script:
   - "tox -e $TOX_ENV"
 
 after_success:
-  - "if [ $TOX_ENV == 'py27' ]; then pip install coveralls; coveralls; fi"
+  - "if [ $TOX_ENV == 'py27' ]; then pip install --pre coveralls; coveralls; fi"
 
 branches:
   except: