diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 00b3aa4..692805b 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -466,6 +466,7 @@
 {
     if (!PyArg_ParseTuple(args, "i:setcheckinterval", &_Py_CheckInterval))
         return NULL;
+    _Py_Ticker = _Py_CheckInterval;
     Py_INCREF(Py_None);
     return Py_None;
 }