diff --git a/include/pybind11/detail/type_caster_odr_guard.h b/include/pybind11/detail/type_caster_odr_guard.h
index 1be8efef0..97092e0ab 100644
--- a/include/pybind11/detail/type_caster_odr_guard.h
+++ b/include/pybind11/detail/type_caster_odr_guard.h
@@ -29,6 +29,7 @@
 #        pragma GCC diagnostic ignored "-Wsubobject-linkage"
 #    endif
 
+#    include "../pytypes.h"
 #    include "common.h"
 #    include "descr.h"
 #    include "typeid.h"