diff --git a/editor/libeditor/HTMLEditor.cpp b/editor/libeditor/HTMLEditor.cpp
index 35c1cd8edac2..05140cc25f3f 100644
--- a/editor/libeditor/HTMLEditor.cpp
+++ b/editor/libeditor/HTMLEditor.cpp
@@ -4965,7 +4965,7 @@ nsIContent* HTMLEditor::GetNextHTMLSibling(nsINode* aNode,
 }
 
 nsIContent* HTMLEditor::GetPreviousHTMLElementOrTextInternal(
-    nsINode& aNode, bool aNoBlockCrossing) const {
+    const nsINode& aNode, bool aNoBlockCrossing) const {
   if (NS_WARN_IF(!GetActiveEditingHost())) {
     return nullptr;
   }
@@ -5003,7 +5003,7 @@ nsIContent* HTMLEditor::GetPreviousEditableHTMLNodeInternal(
 }
 
 nsIContent* HTMLEditor::GetNextHTMLElementOrTextInternal(
-    nsINode& aNode, bool aNoBlockCrossing) const {
+    const nsINode& aNode, bool aNoBlockCrossing) const {
   if (NS_WARN_IF(!GetActiveEditingHost())) {
     return nullptr;
   }
diff --git a/editor/libeditor/HTMLEditor.h b/editor/libeditor/HTMLEditor.h
index 4134ac489a77..1e03edfb5514 100644
--- a/editor/libeditor/HTMLEditor.h
+++ b/editor/libeditor/HTMLEditor.h
@@ -1029,7 +1029,7 @@ class HTMLEditor final : public TextEditor,
    * GetPreviousHTMLElementOrTextInternal() methods are common implementation
    * of above methods.  Please don't use this method directly.
    */
-  nsIContent* GetPreviousHTMLElementOrTextInternal(nsINode& aNode,
+  nsIContent* GetPreviousHTMLElementOrTextInternal(const nsINode& aNode,
                                                    bool aNoBlockCrossing) const;
   template <typename PT, typename CT>
   nsIContent* GetPreviousHTMLElementOrTextInternal(
@@ -1098,7 +1098,7 @@ class HTMLEditor final : public TextEditor,
    * GetNextHTMLNodeInternal() methods are common implementation
    * of above methods.  Please don't use this method directly.
    */
-  nsIContent* GetNextHTMLElementOrTextInternal(nsINode& aNode,
+  nsIContent* GetNextHTMLElementOrTextInternal(const nsINode& aNode,
                                                bool aNoBlockCrossing) const;
   template <typename PT, typename CT>
   nsIContent* GetNextHTMLElementOrTextInternal(