diff --git a/Python/pystate.c b/Python/pystate.c
index 65c244e..ccb0092 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -743,6 +743,10 @@
 void
 _PyGILState_Reinit(void)
 {
+#ifdef WITH_THREAD
+    head_mutex = NULL;
+    HEAD_INIT();
+#endif
     PyThreadState *tstate = PyGILState_GetThisThreadState();
     PyThread_delete_key(autoTLSkey);
     if ((autoTLSkey = PyThread_create_key()) == -1)