diff --git a/.travis.yml b/.travis.yml
index d27fa2157..8324b19c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ language: php
 
 env:
   - PHAN_ALLOW_XDEBUG=0
+  - PHAN_DISABLE_XDEBUG_WARN=1
 
 matrix:
   include: