diff --git a/src/components/style/properties.rs.mako b/src/components/style/properties.rs.mako
index 4608a3b443f..da5ee291eb0 100644
--- a/src/components/style/properties.rs.mako
+++ b/src/components/style/properties.rs.mako
@@ -4,7 +4,7 @@
 
 // This file is a Mako template: http://www.makotemplates.org/
 
-#[allow(non_camel_case_types, uppercase_variables)];
+#![allow(non_camel_case_types, uppercase_variables)]
 
 pub use std::ascii::StrAsciiExt;