1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index 42c7f79..ba33f8c 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -1084,6 +1084,8 @@ bytesiobuf_traverse(bytesiobuf *self, visitproc visit, void *arg)
 static void
 bytesiobuf_dealloc(bytesiobuf *self)
 {
+    /* bpo-31095: UnTrack is needed before calling any callbacks */
+    PyObject_GC_UnTrack(self);
     Py_CLEAR(self->source);
     Py_TYPE(self)->tp_free(self);
 }