diff --git a/.travis.yml b/.travis.yml
index 90a1cc56..f9516bde 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ addons:
   apt:
     sources:
     - sourceline: 'ppa:xapian-backports/ppa'
+    - sourceline: 'ppa:notmuch/notmuch'
     packages:
     - dtach
     - libxapian-dev