diff --git a/.travis.yml b/.travis.yml
index 1338435..076bac7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,12 @@ rust:
     - beta
     - nightly
 
+matrix:
+  include:
+  - rust: 1.18.0
+    script:
+    - cargo test
+
 script:
     - cargo test
     - cargo test --features "i128"