diff --git a/.appveyor.yml b/.appveyor.yml
index f441ec2b..0f1488a0 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -25,8 +25,11 @@ test_script:
   - where chromedriver
   - set CHROMEDRIVER=C:\Tools\WebDriver\chromedriver.exe
   - cargo test -p js-sys --target wasm32-unknown-unknown
-  - cargo test --manifest-path crates/web-sys/Cargo.toml --target wasm32-unknown-unknown --all-features
   - cargo test -p webidl-tests --target wasm32-unknown-unknown
+  # Try just a few features for `web-sys`, unfortunately the whole crate blows
+  # system command line limits meaning we can't even spawn rustc to enable all
+  # the features.
+  - cargo build --manifest-path crates/web-sys/Cargo.toml --target wasm32-unknown-unknown --features 'Node Window Document'
 
 branches:
   only: