diff --git a/.travis.yml b/.travis.yml
index bdde7d2..242b858 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 language: java
 jdk:
+  - openjdk6
+  - openjdk7
+  - oraclejdk7
   - oraclejdk8
   - openjdk8
 install: make travis-install