diff --git a/components/style/properties/helpers.mako.rs b/components/style/properties/helpers.mako.rs
index 209c06df095..d266d3e27ac 100644
--- a/components/style/properties/helpers.mako.rs
+++ b/components/style/properties/helpers.mako.rs
@@ -809,8 +809,10 @@
         use values::generics::rect::Rect;
         use values::specified;
 
-        pub fn parse_value<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
-                                   -> Result<Longhands, ParseError<'i>> {
+        pub fn parse_value<'i, 't>(
+            context: &ParserContext,
+            input: &mut Parser<'i, 't>,
+        ) -> Result<Longhands, ParseError<'i>> {
             let rect = Rect::parse_with(context, input, |_c, i| {
             % if allow_quirks:
                 ${parser_function}_quirky(_c, i, specified::AllowQuirks::Yes)