diff --git a/lib/src/ast/css/modifiable/style_rule.dart b/lib/src/ast/css/modifiable/style_rule.dart
index 6d89bcc8..2d638891 100644
--- a/lib/src/ast/css/modifiable/style_rule.dart
+++ b/lib/src/ast/css/modifiable/style_rule.dart
@@ -14,7 +14,10 @@ import 'value.dart';
 class ModifiableCssStyleRule extends ModifiableCssParentNode
     implements CssStyleRule {
   final ModifiableCssValue<SelectorList> selector;
+
+  /// The selector for this rule, before any extensions are applied.
   final SelectorList originalSelector;
+
   final FileSpan span;
 
   /// Creates a new [ModifiableCssStyleRule].
diff --git a/lib/src/ast/css/style_rule.dart b/lib/src/ast/css/style_rule.dart
index 1c507e5f..53b134f5 100644
--- a/lib/src/ast/css/style_rule.dart
+++ b/lib/src/ast/css/style_rule.dart
@@ -14,7 +14,4 @@ import 'value.dart';
 abstract class CssStyleRule extends CssParentNode {
   /// The selector for this rule.
   CssValue<SelectorList> get selector;
-
-  /// The selector for this rule, before any extensions are applied.
-  SelectorList get originalSelector;
 }