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-rw-r--r--Modules/_collectionsmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 06f85e9..bc225a5 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1482,7 +1482,7 @@ deque_sizeof(dequeobject *deque, void *unused)
Py_ssize_t blocks;
res = sizeof(dequeobject);
- blocks = (deque->leftindex + Py_SIZE(deque) + BLOCKLEN - 1) / BLOCKLEN;
+ blocks = (size_t)(deque->leftindex + Py_SIZE(deque) + BLOCKLEN - 1) / BLOCKLEN;
assert(deque->leftindex + Py_SIZE(deque) - 1 ==
(blocks - 1) * BLOCKLEN + deque->rightindex);
res += blocks * sizeof(block);