diff --git a/.travis.yml b/.travis.yml
index 77974ec1..f21c36f3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: erlang
 otp_release:
+  - R15B03-1
   - R16B03-1
   - 17.4
 before_script: