diff --git a/src/selector/extend/extended_selector.rs b/src/selector/extend/extended_selector.rs
index 9c33a2d..1f54a43 100644
--- a/src/selector/extend/extended_selector.rs
+++ b/src/selector/extend/extended_selector.rs
@@ -6,9 +6,17 @@ use std::{
 
 use crate::selector::{Selector, SelectorList};
 
-#[derive(Debug, Clone, Eq, PartialEq)]
+#[derive(Debug, Clone)]
 pub(crate) struct ExtendedSelector(Rc<RefCell<SelectorList>>);
 
+impl PartialEq for ExtendedSelector {
+    fn eq(&self, other: &Self) -> bool {
+        self.0 == other.0
+    }
+}
+
+impl Eq for ExtendedSelector {}
+
 impl Hash for ExtendedSelector {
     fn hash<H: Hasher>(&self, state: &mut H) {
         self.0.borrow().hash(state);
diff --git a/src/selector/extend/mod.rs b/src/selector/extend/mod.rs
index 62c2a46..8e293f6 100644
--- a/src/selector/extend/mod.rs
+++ b/src/selector/extend/mod.rs
@@ -875,13 +875,13 @@ impl Extender {
                 .replace(&mut media_query_context);
         }
         let extended_selector = ExtendedSelector::new(selector.clone());
-        self.register_selector(selector, extended_selector.clone());
+        self.register_selector(selector, &extended_selector);
         extended_selector
     }
 
     /// Registers the `SimpleSelector`s in `list` to point to `selector` in
     /// `self.selectors`.
-    fn register_selector(&mut self, list: SelectorList, selector: ExtendedSelector) {
+    fn register_selector(&mut self, list: SelectorList, selector: &ExtendedSelector) {
         for complex in list.components {
             for component in complex.components {
                 if let ComplexSelectorComponent::Compound(component) = component {
@@ -896,7 +896,7 @@ impl Extender {
                             ..
                         }) = simple
                         {
-                            self.register_selector(simple_selector, selector.clone());
+                            self.register_selector(simple_selector, selector);
                         }
                     }
                 }
@@ -1145,7 +1145,7 @@ impl Extender {
             if old_value == selector_as_selector {
                 continue;
             }
-            self.register_selector(selector_as_selector, selector);
+            self.register_selector(selector_as_selector, &selector);
         }
     }
 }