diff --git a/.travis.yml b/.travis.yml
index ae3348b..82012d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ services:
 compiler: gcc
 
 env:
-  - UNATTENDED=--assume-yes
+  - UNATTENDED="--assume-yes"
 
 addons:
   apt: