python
diff --git a/‎Modules/_io/bufferedio.c
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+1Lines changed: 1 addition & 0 deletions b/‎Modules/_io/bufferedio.c
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diff --git a/‎Modules/_io/iobase.c
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+1Lines changed: 1 addition & 0 deletions b/‎Modules/_io/iobase.c
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diff --git a/‎Modules/_io/textio.c
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@@ -2440,6 +2440,7 @@ static PyType_Slot bufferediobase_slots[] = {
     {0, NULL},
 };
 
+/* Do not set Py_TPFLAGS_HAVE_GC so that tp_traverse and tp_clear are inherited */
 PyType_Spec bufferediobase_spec = {
     .name = "_io._BufferedIOBase",
     .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
 
@@ -1050,6 +1050,7 @@ static PyType_Slot rawiobase_slots[] = {
     {0, NULL},
 };
 
+/* Do not set Py_TPFLAGS_HAVE_GC so that tp_traverse and tp_clear are inherited */
 PyType_Spec rawiobase_spec = {
     .name = "_io._RawIOBase",
     .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
 
@@ -190,6 +190,7 @@ static PyType_Slot textiobase_slots[] = {
     {0, NULL},
 };
 
+/* Do not set Py_TPFLAGS_HAVE_GC so that tp_traverse and tp_clear are inherited */
 PyType_Spec textiobase_spec = {
     .name = "_io._TextIOBase",
     .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |