diff --git a/include/pybind11/detail/cpp_conduit.h b/include/pybind11/detail/cpp_conduit.h
index 70843753..b1ccd31c 100644
--- a/include/pybind11/detail/cpp_conduit.h
+++ b/include/pybind11/detail/cpp_conduit.h
@@ -1,5 +1,7 @@
 // Copyright (c) 2024 The pybind Community.
 
+// IWYU pragma: private, include "third_party/pybind11/include/pybind11/pybind11.h"
+
 #pragma once
 
 #include <pybind11/pytypes.h>