diff --git a/components/style/properties/mod.rs.mako b/components/style/properties/mod.rs.mako
index 6987333ec1c..d51d5d91e14 100644
--- a/components/style/properties/mod.rs.mako
+++ b/components/style/properties/mod.rs.mako
@@ -5,7 +5,6 @@
 // This file is a Mako template: http://www.makotemplates.org/
 
 pub use std::ascii::StrAsciiExt;
-use serialize::{Encodable, Encoder};
 
 use servo_util::logical_geometry::{WritingMode, LogicalMargin};
 use sync::Arc;
@@ -1463,12 +1462,6 @@ pub struct PropertyDeclarationBlock {
     pub normal: Arc<Vec<PropertyDeclaration>>,
 }
 
-impl<E, S: Encoder<E>> Encodable<S, E> for PropertyDeclarationBlock {
-    fn encode(&self, _: &mut S) -> Result<(), E> {
-        Ok(())
-    }
-}
-
 
 pub fn parse_style_attribute(input: &str, base_url: &Url) -> PropertyDeclarationBlock {
     parse_property_declaration_list(tokenize(input), base_url)