diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index eb513d4f107..0ead08ccdcc 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -1551,6 +1551,7 @@ impl<T> Default for LayerOrderedMap<T> {
     }
 }
 
+#[cfg(feature = "gecko")]
 impl<T: 'static> LayerOrderedVec<T> {
     fn clear(&mut self) {
         self.0.clear();
@@ -1567,6 +1568,7 @@ impl<T: 'static> LayerOrderedMap<T> {
     fn clear(&mut self) {
         self.0.clear();
     }
+    #[cfg(feature = "gecko")]
     fn try_insert(&mut self, name: Atom, v: T, id: LayerId) -> Result<(), FailedAllocationError> {
         self.try_insert_with(name, v, id, |_, _| Ordering::Equal)
     }
@@ -1583,6 +1585,7 @@ impl<T: 'static> LayerOrderedMap<T> {
         vec.push((v, id));
         Ok(())
     }
+    #[cfg(feature = "gecko")]
     fn sort(&mut self, layers: &[CascadeLayer]) {
         self.sort_with(layers, |_, _| Ordering::Equal)
     }
@@ -2255,7 +2258,10 @@ impl CascadeData {
                 order.inc();
             }
         }
-        self.extra_data.sort_by_layer(&self.layers);
+        #[cfg(feature = "gecko")]
+        {
+            self.extra_data.sort_by_layer(&self.layers);
+        }
         self.animations.sort_with(&self.layers, compare_keyframes_in_same_layer);
     }
 
@@ -2782,7 +2788,10 @@ impl CascadeData {
         self.layer_id.clear();
         self.layers.clear();
         self.layers.push(CascadeLayer::root());
-        self.extra_data.clear();
+        #[cfg(feature = "gecko")]
+        {
+            self.extra_data.clear();
+        }
         self.rules_source_order = 0;
         self.num_selectors = 0;
         self.num_declarations = 0;