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-rw-r--r--Modules/_sha3/sha3module.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/_sha3/sha3module.c b/Modules/_sha3/sha3module.c
index 27f6938..aba7f6d 100644
--- a/Modules/_sha3/sha3module.c
+++ b/Modules/_sha3/sha3module.c
@@ -525,7 +525,7 @@ static PyGetSetDef SHA3_getseters[] = {
static PyType_Spec type_spec_obj = { \
.name = "_sha3." type_name, \
.basicsize = sizeof(SHA3object), \
- .flags = Py_TPFLAGS_DEFAULT, \
+ .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE, \
.slots = type_slots \
}