diff --git a/pyglossary/sq_entry_list.py b/pyglossary/sq_entry_list.py
index dd5db464e..2a3e35954 100644
--- a/pyglossary/sq_entry_list.py
+++ b/pyglossary/sq_entry_list.py
@@ -21,7 +21,7 @@
 import os
 from os.path import isfile
 from pickle import dumps, loads
-from typing import TYPE_CHECKING, Self
+from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
 	from collections.abc import Callable, Iterable, Iterator
@@ -30,6 +30,10 @@
 	from .glossary_types import EntryType, RawEntryType
 	from .sort_keys import NamedSortKey
 
+# from typing import Self
+# typing.Self is new in Python 3.11.
+
+
 
 __all__ = ["SqEntryList"]
 
@@ -156,7 +160,7 @@ def append(self, entry: "EntryType") -> None:
 		if self._len % 1000 == 0:
 			self._con.commit()
 
-	def __iadd__(self, other: "Iterable") -> Self:
+	def __iadd__(self, other: "Iterable"):  # -> Self
 		for item in other:
 			self.append(item)
 		return self
diff --git a/pyproject.toml b/pyproject.toml
index 4c8f7e618..ac5e6aa3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,6 +65,7 @@ lint.select = [
     "RUF",   # Ruff-specific rules
 ]
 lint.ignore = [
+    "PYI034", # py3.11: `__iadd__` methods in classes like `SqEntryList` usually return `self` at runtime
     "PT027", # Use `pytest.raises` instead of unittest-style `assertRaises`
     "PD011", # Use `.to_numpy()` instead of `.values`, WTF?
     "ICN001", # `tkinter` should be imported as `tk`, WTF?