diff --git a/.travis.yml b/.travis.yml
index f6dd3dd..053ba1f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,11 @@ matrix:
     - rust: stable
     - rust: beta
     - rust: nightly
+    # ensure wasm always builds
+    - rust: stable
+      script:
+        - rustup target add wasm32-unknown-unknown
+        - cargo build --target=wasm32-unknown-unknown
     # minimum rustc version
     - rust: 1.20.0
       script: cargo build