diff --git a/components/style/lib.rs b/components/style/lib.rs
index f6c310a18c8..70737c81644 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -26,6 +26,7 @@
 #![cfg_attr(feature = "servo", feature(proc_macro))]
 
 #![deny(warnings)]
+#![cfg_attr(feature = "servo", deny(missing_docs))]
 
 // FIXME(bholley): We need to blanket-allow unsafe code in order to make the
 // gecko atom!() macro work. When Rust 1.14 is released [1], we can uncomment