2 files changed, 2 insertions, 2 deletions
diff --git a/app/tree_model.h b/app/tree_model.h
index 593f677..f6d8da3 100644
--- a/app/tree_model.h
+++ b/app/tree_model.h
@@ -20,7 +20,7 @@ class TreeModel;
 class TreeModelNode {
  public:
   // Returns the title for the node.
-  virtual std::wstring GetTitle() = 0;
+  virtual const std::wstring& GetTitle() const = 0;
 };
 
 // Observer for the TreeModel. Notified of significant events to the model.
diff --git a/app/tree_node_model.h b/app/tree_node_model.h
index 69d5c8d..7767d49 100644
--- a/app/tree_node_model.h
+++ b/app/tree_node_model.h
@@ -131,7 +131,7 @@ class TreeNode : public TreeModelNode {
   }
 
   // Returns the title of the node.
-  std::wstring GetTitle() {
+  virtual const std::wstring& GetTitle() const {
     return title_;
   }