diff --git a/.travis.yml b/.travis.yml
index 172480a8..88563585 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ services:
 
 env:
     global:
-        - CORE_BRANCH=master
+        - CORE_BRANCH=stable18
     matrix:
         - DB=pgsql