diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 3980700407f..c262af439ca 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -83,7 +83,6 @@ pub struct ComputedValues(::gecko_bindings::structs::mozilla::ComputedStyle);
 impl ComputedValues {
     pub fn new(
         device: &Device,
-        parent: Option<<&ComputedValues>,
         pseudo: Option<<&PseudoElement>,
         custom_properties: Option<Arc<CustomPropertiesMap>>,
         writing_mode: WritingMode,
@@ -105,7 +104,6 @@ impl ComputedValues {
             % endfor
         ).to_outer(
             device.pres_context(),
-            parent,
             pseudo.map(|p| p.pseudo_info())
         )
     }
@@ -120,7 +118,7 @@ impl ComputedValues {
             % for style_struct in data.style_structs:
             style_structs::${style_struct.name}::default(pres_context),
             % endfor
-        ).to_outer(pres_context, None, None)
+        ).to_outer(pres_context, None)
     }
 
     pub fn pseudo(&self) -> Option<PseudoElement> {
@@ -195,7 +193,6 @@ impl Clone for ComputedValuesInner {
 }
 
 type PseudoInfo = (*mut structs::nsAtom, structs::CSSPseudoElementType);
-type ParentComputedStyleInfo<'a> = Option< &'a ComputedValues>;
 
 impl ComputedValuesInner {
     pub fn new(custom_properties: Option<Arc<CustomPropertiesMap>>,
@@ -222,7 +219,6 @@ impl ComputedValuesInner {
     fn to_outer(
         self,
         pres_context: RawGeckoPresContextBorrowed,
-        parent: ParentComputedStyleInfo,
         info: Option<PseudoInfo>
     ) -> Arc<ComputedValues> {
         let (tag, ty) = if let Some(info) = info {
@@ -231,21 +227,24 @@ impl ComputedValuesInner {
             (ptr::null_mut(), structs::CSSPseudoElementType::NotPseudo)
         };
 
-        unsafe { self.to_outer_helper(pres_context, parent, ty, tag) }
+        unsafe { self.to_outer_helper(pres_context, ty, tag) }
     }
 
     unsafe fn to_outer_helper(
         self,
         pres_context: bindings::RawGeckoPresContextBorrowed,
-        parent: ParentComputedStyleInfo,
         pseudo_ty: structs::CSSPseudoElementType,
         pseudo_tag: *mut structs::nsAtom
     ) -> Arc<ComputedValues> {
         let arc = {
             let arc: Arc<ComputedValues> = Arc::new(uninitialized());
-            bindings::Gecko_ComputedStyle_Init(&arc.0 as *const _ as *mut _,
-                                                   parent, pres_context,
-                                                   &self, pseudo_ty, pseudo_tag);
+            bindings::Gecko_ComputedStyle_Init(
+                &arc.0 as *const _ as *mut _,
+                pres_context,
+                &self,
+                pseudo_ty,
+                pseudo_tag
+            );
             // We're simulating a move by having C++ do a memcpy and then forgetting
             // it on this end.
             forget(self);
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index 9372068b052..a4396d0b4fd 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -2720,7 +2720,6 @@ impl ComputedValues {
     /// Create a new refcounted `ComputedValues`
     pub fn new(
         _: &Device,
-        _: Option<<&ComputedValues>,
         _: Option<<&PseudoElement>,
         custom_properties: Option<Arc<::custom_properties::CustomPropertiesMap>>,
         writing_mode: WritingMode,
@@ -3128,10 +3127,6 @@ pub struct StyleBuilder<'a> {
     /// The style we're getting reset structs from.
     reset_style: &'a ComputedValues,
 
-    /// The style we're inheriting from explicitly, or none if we're the root of
-    /// a subtree.
-    parent_style: Option<<&'a ComputedValues>,
-
     /// The rule node representing the ordered list of rules matched for this
     /// node.
     pub rules: Option<StrongRuleNode>,
@@ -3199,7 +3194,6 @@ impl<'a> StyleBuilder<'a> {
 
         StyleBuilder {
             device,
-            parent_style,
             inherited_style,
             inherited_style_ignoring_first_line,
             reset_style,
@@ -3243,7 +3237,6 @@ impl<'a> StyleBuilder<'a> {
                       parent_style.unwrap().pseudo() != Some(PseudoElement::FirstLine));
         StyleBuilder {
             device,
-            parent_style,
             inherited_style,
             // None of our callers pass in ::first-line parent styles.
             inherited_style_ignoring_first_line: inherited_style,
@@ -3485,7 +3478,6 @@ impl<'a> StyleBuilder<'a> {
     pub fn build(self) -> Arc<ComputedValues> {
         ComputedValues::new(
             self.device,
-            self.parent_style,
             self.pseudo,
             self.custom_properties,
             self.writing_mode,