diff --git a/.travis.yml b/.travis.yml
index 4d7a614..8b6543d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ sudo: false
 cache: pip
 
 addons:
+  postgresql: "9.6"
   apt:
     packages:
       - expect-dev  # provides unbuffer utility