diff --git a/.travis.yml b/.travis.yml
index 3c5da86..de7125a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,3 +2,6 @@ language: php
 php:
   - "5.4"
   - "5.3"
+before_script:
+  - pear channel-discover phpseclib.sourceforge.net
+  - pear install phpseclib/Crypt_RSA