PyEval_CallObject requires a tuple of args (closes #13186)
diff --git a/Misc/NEWS b/Misc/NEWS
index 03c4569..6fdcc6f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,9 @@
 Core and Builtins
 -----------------
 
+- Issue #13186: Fix __delitem__ on old-style instances when invoked through
+  PySequence_DelItem.
+
 - Issue #13156: Revert the patch for issue #10517 (reset TLS upon fork()),
   which was only relevant for the native pthread TLS implementation.