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-rw-r--r--Modules/mmapmodule.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 8327ba6..6397b0d 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1121,7 +1121,8 @@ static PyType_Slot mmap_object_slots[] = {
static PyType_Spec mmap_object_spec = {
.name = "mmap.mmap",
.basicsize = sizeof(mmap_object),
- .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC),
+ .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
+ Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_IMMUTABLETYPE),
.slots = mmap_object_slots,
};