diff --git a/.travis.yml b/.travis.yml
index fae6934e..c2778bb7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@ services:
 env:
   global:
   - TEST_JS=FALSE
-  - CORE_BRANCH=master
+  - CORE_BRANCH=stable18
   matrix:
   - DB=sqlite