diff --git a/.travis.yml b/.travis.yml
index dc6c4bc..9847d5a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,11 @@ sudo: false
 script:
   - cargo build --verbose
   - cargo test --verbose
-  - [ "$TRAVIS_RUST_VERSION" = "1.0" ] || cargo test --verbose --features no_std
+  - if [ "$TRAVIS_RUST_VERSION" = "nightly" ]; then
+       cargo test --verbose --features no_std
+       cargo test --verbose --features assignment_operators;
+       cargo test --verbose --features "no_std assignment_operators";
+    fi
   - cargo doc
 after_success: |
   [ $TRAVIS_BRANCH = master ] &&