diff --git a/components/style/gecko/generated/bindings.rs b/components/style/gecko/generated/bindings.rs
index 090d2096d07..0f8c9d3e91a 100644
--- a/components/style/gecko/generated/bindings.rs
+++ b/components/style/gecko/generated/bindings.rs
@@ -503,8 +503,6 @@ extern "C" {
  pub fn Gecko_RecordTraversalStatistics ( total : u32 , parallel : u32 , total_t : u32 , parallel_t : u32 , total_s : u32 , parallel_s : u32 , ) ; 
 } extern "C" {
  pub fn Gecko_IsInDocument ( node : RawGeckoNodeBorrowed , ) -> bool ; 
-} extern "C" {
- pub fn Gecko_FlattenedTreeParentIsParent ( node : RawGeckoNodeBorrowed , ) -> bool ; 
 } extern "C" {
  pub fn Gecko_IsSignificantChild ( node : RawGeckoNodeBorrowed , text_is_significant : bool , whitespace_is_significant : bool , ) -> bool ; 
 } extern "C" {
@@ -1599,4 +1597,4 @@ extern "C" {
  pub fn Gecko_GetElementsWithId ( aDocument : * const nsIDocument , aId : * mut nsAtom , ) -> * const nsTArray < * mut Element > ; 
 } extern "C" {
  pub fn Gecko_GetBoolPrefValue ( pref_name : * const :: std :: os :: raw :: c_char , ) -> bool ; 
-}
\ No newline at end of file
+}
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 5aa09092492..f8a1837de33 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -236,13 +236,23 @@ impl<'ln> GeckoNode<'ln> {
 
     #[inline]
     fn flattened_tree_parent(&self) -> Option<Self> {
-        let fast_path = self.flattened_tree_parent_is_parent();
-        debug_assert!(fast_path == unsafe { bindings::Gecko_FlattenedTreeParentIsParent(self.0) });
-        if fast_path {
-            unsafe { self.0.mParent.as_ref().map(GeckoNode) }
-        } else {
-            unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).map(GeckoNode) }
+        // TODO(emilio): Measure and consider not doing this fast-path and take
+        // always the common path, it's only a function call and from profiles
+        // it seems that keeping this fast path makes the compiler not inline
+        // `flattened_tree_parent`.
+        if self.flattened_tree_parent_is_parent() {
+            debug_assert_eq!(
+                unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).map(GeckoNode) },
+                self.parent_node(),
+                "Fast path stopped holding!"
+            );
+
+            return self.parent_node();
         }
+
+        // NOTE(emilio): If this call is too expensive, we could manually
+        // inline more aggressively.
+        unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).map(GeckoNode) }
     }
 
     #[inline]