diff --git a/mesonbuild/interpreterbase/interpreterbase.py b/mesonbuild/interpreterbase/interpreterbase.py
index 3d419d436..6e942b71a 100644
--- a/mesonbuild/interpreterbase/interpreterbase.py
+++ b/mesonbuild/interpreterbase/interpreterbase.py
@@ -54,7 +54,9 @@ import textwrap
 from functools import wraps
 
 if T.TYPE_CHECKING:
-    from ..interpreter import Interpreter
+    # T.cast is not handled by flake8 to detect quoted annotation use
+    # see https://github.com/PyCQA/pyflakes/pull/632
+    from ..interpreter import Interpreter # noqa
 
 HolderMapType = T.Dict[
     T.Union[
diff --git a/mesonbuild/mlog.py b/mesonbuild/mlog.py
index 06d8a0b49..da9e2a53a 100644
--- a/mesonbuild/mlog.py
+++ b/mesonbuild/mlog.py
@@ -22,7 +22,9 @@ from contextlib import contextmanager
 from pathlib import Path
 
 if T.TYPE_CHECKING:
-    from ._typing import StringProtocol, SizedStringProtocol
+    # T.Union is not handled by flake8 to detect quoted annotation use (StringProtocol)
+    # see https://github.com/PyCQA/pyflakes/pull/632
+    from ._typing import StringProtocol, SizedStringProtocol # noqa: F401
 
 """This is (mostly) a standalone module used to write logging
 information about Meson runs. Some output goes to screen,