diff --git a/dom/base/DocGroup.cpp b/dom/base/DocGroup.cpp
index f50ffa599e47..8403ac6157b9 100644
--- a/dom/base/DocGroup.cpp
+++ b/dom/base/DocGroup.cpp
@@ -382,10 +382,5 @@ bool DocGroup::IsActive() const {
   return false;
 }
 
-void DocGroup::ClearEventTarget() {
-  nsCOMPtr<LabellingEventTarget> target = do_QueryInterface(mEventTarget);
-  target->ClearDocGroup();
-}
-
 }  // namespace dom
 }  // namespace mozilla
diff --git a/dom/base/DocGroup.h b/dom/base/DocGroup.h
index f09790529684..5c8100a7f056 100644
--- a/dom/base/DocGroup.h
+++ b/dom/base/DocGroup.h
@@ -130,8 +130,6 @@ class DocGroup final {
 
   bool IsEmpty() const { return mDocuments.IsEmpty(); }
 
-  void ClearEventTarget();
-
  private:
   DocGroup(BrowsingContextGroup* aBrowsingContextGroup, const nsACString& aKey);