diff --git a/.travis.yml b/.travis.yml
index a56f59e..09ebb07 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,11 @@ addons:
  postgresql: "9.3"
 
 matrix:
+  allow_failures:
+  - DB=pgsql MOODLE_BRANCH=MOODLE_31_STABLE
+  - DB=mysqli MOODLE_BRANCH=MOODLE_31_STABLE
+  - DB=pgsql MOODLE_BRANCH=master
+  - DB=mysqli MOODLE_BRANCH=master
   exclude:
     - php: 7.1
       env: DB=mysqli MOODLE_BRANCH=MOODLE_31_STABLE