diff --git a/.travis.yml b/.travis.yml
index 526648e..709f428 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,11 @@ rust:
   - nightly
 
 env:
-  - TEST_COMMAND=test FEATURES='yolocrypto'
-  - TEST_COMMAND=test FEATURES='yolocrypto nightly'
-  - TEST_COMMAND=bench FEATURES='yolocrypto bench'
-  - TEST_COMMAND=bench FEATURES='yolocrypto nightly bench'
+  - TEST_COMMAND=test FEATURES=--features="yolocrypto"
+  - TEST_COMMAND=test FEATURES=--features="yolocrypto nightly"
+  - TEST_COMMAND=bench FEATURES=--features="yolocrypto bench"
+  - TEST_COMMAND=bench FEATURES=--features="yolocrypto nightly bench"
+  - TEST_COMMAND=build FEATURES=--no-default-features
 
 matrix:
   exclude:
@@ -18,18 +19,23 @@ matrix:
     # run benchmarks, which causes dalek not to build on stable.  See
     # https://github.com/isislovecruft/curve25519-dalek/pull/38#issuecomment-286027562
     - rust: stable
-      env: TEST_COMMAND=bench FEATURES='yolocrypto bench'
+      env: TEST_COMMAND=bench FEATURES=--features="yolocrypto bench"
     - rust: beta
-      env: TEST_COMMAND=bench FEATURES='yolocrypto bench'
+      env: TEST_COMMAND=bench FEATURES=--features="yolocrypto bench"
     - rust: stable
-      env: TEST_COMMAND=bench FEATURES='yolocrypto nightly bench'
+      env: TEST_COMMAND=bench FEATURES=--features="yolocrypto nightly bench"
     - rust: beta
-      env: TEST_COMMAND=bench FEATURES='yolocrypto nightly bench'
+      env: TEST_COMMAND=bench FEATURES=--features="yolocrypto nightly bench"
     # Test nightly features, such as radix_51, only on nightly.
     - rust: stable
-      env: TEST_COMMAND=test FEATURES='yolocrypto nightly'
+      env: TEST_COMMAND=test FEATURES=--features="yolocrypto nightly"
     - rust: beta
-      env: TEST_COMMAND=test FEATURES='yolocrypto nightly'
+      env: TEST_COMMAND=test FEATURES=--features="yolocrypto nightly"
+    # Test no_std only on nightly.
+    - rust: stable
+      env: TEST_COMMAND=build FEATURES=--no-default-features
+    - rust: beta
+      env: TEST_COMMAND=build FEATURES=--no-default-features
 
 script:
-  - cargo $TEST_COMMAND --features="$FEATURES"
+  - cargo $TEST_COMMAND $FEATURES