diff --git a/onnxruntime/core/optimizer/graph_transformer_mgr.h b/onnxruntime/core/optimizer/graph_transformer_mgr.h
index 64ec5e8bbd..26df444af5 100644
--- a/onnxruntime/core/optimizer/graph_transformer_mgr.h
+++ b/onnxruntime/core/optimizer/graph_transformer_mgr.h
@@ -26,7 +26,6 @@ class GraphTransformerManager {
   common::Status ApplyTransformers(Graph& graph, const TransformerLevel& level) const;
 
  private:
-  GraphTransformerManager() = default;
   ORT_DISALLOW_COPY_ASSIGNMENT_AND_MOVE(GraphTransformerManager);
 
   const std::vector<std::string>& GetProvidersForTransformer(const std::string& name) const {