diff --git a/.travis.yml b/.travis.yml
index 57a75a7f..0603fcab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,4 +17,4 @@ script:
     - cargo build --verbose
     - cargo build --verbose --features arbitrary
     - cargo build --verbose --features serde-serialize
-    - cargo test --verbose --features "arbitrary serde-serialize"
+    - cargo test --verbose --features "arbitrary debug serde-serialize"