diff --git a/.travis.yml b/.travis.yml
index d723516..e3c1c30 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,7 +21,7 @@ php:
 
 env:
  global:
-  - MOODLE_BRANCH=master
+  - MOODLE_BRANCH=MOODLE_33_STABLE
  matrix:
   - DB=pgsql
   - DB=mysqli