diff --git a/components/style/lib.rs b/components/style/lib.rs
index d789c1d3305..8a343496e6d 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -23,7 +23,6 @@
 //! [cssparser]: ../cssparser/index.html
 //! [selectors]: ../selectors/index.html
 
-#![deny(warnings)]
 #![deny(missing_docs)]
 
 #![recursion_limit = "500"]  // For define_css_keyword_enum! in -moz-appearance
diff --git a/ports/geckolib/lib.rs b/ports/geckolib/lib.rs
index ca57307c245..15c42509a81 100644
--- a/ports/geckolib/lib.rs
+++ b/ports/geckolib/lib.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![deny(warnings)]
 
 extern crate cssparser;
 extern crate env_logger;
diff --git a/support/gecko/nsstring/src/lib.rs b/support/gecko/nsstring/src/lib.rs
index 0321e38f8bb..d5c5f147c48 100644
--- a/support/gecko/nsstring/src/lib.rs
+++ b/support/gecko/nsstring/src/lib.rs
@@ -113,7 +113,6 @@
 //! which invoke their member's destructors through C++ code.
 
 #![allow(non_camel_case_types)]
-#![deny(warnings)]
 
 #[macro_use]
 extern crate bitflags;