diff --git a/Include/pystate.h b/Include/pystate.h
index cf29695..4919d99 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -21,6 +21,7 @@
     PyObject *modules;
     PyObject *sysdict;
     PyObject *builtins;
+    PyObject *modules_reloading;
 
     PyObject *codec_search_path;
     PyObject *codec_search_cache;