diff --git a/components/style/values/specified/color.rs b/components/style/values/specified/color.rs
index 3500c3aa73d..85d8d613290 100644
--- a/components/style/values/specified/color.rs
+++ b/components/style/values/specified/color.rs
@@ -494,6 +494,7 @@ impl<'a, 'b: 'a, 'i: 'a> ::cssparser::ColorComponentParser<'i> for ColorComponen
     }
 }
 
+#[cfg(feature = "gecko")]
 fn parse_moz_system_color<'i, 't>(
     context: &ParserContext,
     input: &mut Parser<'i, 't>,