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-rw-r--r--Modules/itertoolsmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index bd5543cae7..62b2c19b90 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -1919,7 +1919,7 @@ product_next(productobject *lz)
Py_DECREF(old_result);
}
/* Now, we've got the only copy so we can update it in-place */
- assert (Py_REFCNT(result) == 1);
+ assert (npools==0 || Py_REFCNT(result) == 1);
/* Update the pool indices right-to-left. Only advance to the
next pool when the previous one rolls-over */