diff --git a/accessible/ipc/DocAccessibleParent.h b/accessible/ipc/DocAccessibleParent.h
index eccac581806..9e424455a1c 100644
--- a/accessible/ipc/DocAccessibleParent.h
+++ b/accessible/ipc/DocAccessibleParent.h
@@ -85,7 +85,7 @@ public:
    */
   void RemoveChildDoc(DocAccessibleParent* aChildDoc)
   {
-    aChildDoc->mParent->SetChildDoc(nullptr);
+    aChildDoc->Parent()->SetChildDoc(nullptr);
     mChildDocs.RemoveElement(aChildDoc);
     aChildDoc->mParentDoc = nullptr;
     MOZ_ASSERT(aChildDoc->mChildDocs.Length() == 0);
diff --git a/accessible/ipc/ProxyAccessible.h b/accessible/ipc/ProxyAccessible.h
index 7645ae98491..d53e48cbcfd 100644
--- a/accessible/ipc/ProxyAccessible.h
+++ b/accessible/ipc/ProxyAccessible.h
@@ -46,7 +46,7 @@ public:
   ProxyAccessible* ChildAt(uint32_t aIdx) const { return mChildren[aIdx]; }
 
   // XXX evaluate if this is fast enough.
-  size_t IndexInParent() const { return mParent->mChildren.IndexOf(this); }
+  size_t IndexInParent() const { return Parent()->mChildren.IndexOf(this); }
   int32_t IndexOfEmbeddedChild(const ProxyAccessible*);
   bool MustPruneChildren() const;