diff --git a/Modules/_zstd/_zstdmodule.c b/Modules/_zstd/_zstdmodule.c
index bddef0d0b864cd..c3852fe89732bc 100644
--- a/Modules/_zstd/_zstdmodule.c
+++ b/Modules/_zstd/_zstdmodule.c
@@ -679,6 +679,9 @@ do { \
ADD_INT_CONST_TO_TYPE(mod_state->ZstdCompressor_type,
"FLUSH_FRAME", ZSTD_e_end);
+ /* Make ZstdCompressor immutable (set Py_TPFLAGS_IMMUTABLETYPE) */
+ PyType_Freeze(mod_state->ZstdCompressor_type);
+
#undef ADD_TYPE
#undef ADD_INT_MACRO
#undef ADD_ZSTD_COMPRESSOR_INT_CONST
diff --git a/Modules/_zstd/compressor.c b/Modules/_zstd/compressor.c
index e70eb637b29f3e..355a27d2734a1b 100644
--- a/Modules/_zstd/compressor.c
+++ b/Modules/_zstd/compressor.c
@@ -729,6 +729,9 @@ static PyType_Slot zstdcompressor_slots[] = {
PyType_Spec zstd_compressor_type_spec = {
.name = "compression.zstd.ZstdCompressor",
.basicsize = sizeof(ZstdCompressor),
+ // Py_TPFLAGS_IMMUTABLETYPE is not used here as several
+ // associated constants need to be added to the type.
+ // PyType_Freeze is called later to set the flag.
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
.slots = zstdcompressor_slots,
};
diff --git a/Modules/_zstd/decompressor.c b/Modules/_zstd/decompressor.c
index 2ed88cd3f231f1..a654a9540e1f05 100644
--- a/Modules/_zstd/decompressor.c
+++ b/Modules/_zstd/decompressor.c
@@ -902,6 +902,7 @@ static PyType_Slot ZstdDecompressor_slots[] = {
PyType_Spec zstd_decompressor_type_spec = {
.name = "compression.zstd.ZstdDecompressor",
.basicsize = sizeof(ZstdDecompressor),
- .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+ .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE
+ | Py_TPFLAGS_HAVE_GC,
.slots = ZstdDecompressor_slots,
};
diff --git a/Modules/_zstd/zstddict.c b/Modules/_zstd/zstddict.c
index 99976cef85a210..47bc8a84ca24a7 100644
--- a/Modules/_zstd/zstddict.c
+++ b/Modules/_zstd/zstddict.c
@@ -278,6 +278,7 @@ static PyType_Slot zstddict_slots[] = {
PyType_Spec zstd_dict_type_spec = {
.name = "compression.zstd.ZstdDict",
.basicsize = sizeof(ZstdDict),
- .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+ .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE
+ | Py_TPFLAGS_HAVE_GC,
.slots = zstddict_slots,
};
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