diff --git a/.travis.yml b/.travis.yml
index bd55779..1c5372e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ addons:
     - g++-5
     - clang-3.8
     - libev-dev
+    - libssl-dev
     - cmake
     - cmake-data
 before_install: