diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index 36dc59298dd3..429c3a0ca427 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -5064,11 +5064,6 @@ static bool HasPresShell(nsPIDOMWindowOuter* aWindow) {
   return docShell->GetPresShell() != nullptr;
 }
 
-nsresult Document::SetEditingState(EditingState aState) {
-  mEditingState = aState;
-  return NS_OK;
-}
-
 nsresult Document::EditingStateChanged() {
   if (mRemovedFromDocShell) {
     return NS_OK;
diff --git a/dom/base/Document.h b/dom/base/Document.h
index 5d1f8d375dd1..bb9a6ff453b0 100644
--- a/dom/base/Document.h
+++ b/dom/base/Document.h
@@ -1794,7 +1794,7 @@ class Document : public nsINode,
    * to enable/disable editing, call EditingStateChanged() or
    * SetDesignMode().
    */
-  nsresult SetEditingState(EditingState aState);
+  void SetEditingState(EditingState aState) { mEditingState = aState; }
 
   /**
    * Called when this Document's editor is destroyed.