diff --git a/include/pybind11/conduit/wrap_include_python_h.h b/include/pybind11/conduit/wrap_include_python_h.h
index 316d1afc8..713dc4bb6 100644
--- a/include/pybind11/conduit/wrap_include_python_h.h
+++ b/include/pybind11/conduit/wrap_include_python_h.h
@@ -50,7 +50,7 @@
 #endif
 
 #if defined(PYBIND11_DEBUG_MARKER)
-#    define _DEBUG
+#    define _DEBUG 1
 #    undef PYBIND11_DEBUG_MARKER
 #endif