diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index a41f55b..7fcbb10 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -2072,7 +2072,7 @@
 static PyObject *
 count_next(countobject *lz)
 {
-	return PyInt_FromSize_t(lz->cnt++);
+	return PyInt_FromSsize_t(lz->cnt++);
 }
 
 static PyObject *