diff --git a/Tests/test_file_avif.py b/Tests/test_file_avif.py
index 3dc5c87aaee..119a98d536c 100644
--- a/Tests/test_file_avif.py
+++ b/Tests/test_file_avif.py
@@ -313,7 +313,7 @@ def test_exif_save(
             else:
                 assert reloaded.info["exif"] == exif_data
 
-    def test_exif_without_orientation(self, tmp_path: Path):
+    def test_exif_without_orientation(self, tmp_path: Path) -> None:
         exif = Image.Exif()
         exif[272] = b"test"
         exif_data = exif.tobytes()
@@ -570,7 +570,7 @@ def test_svt_optimizations(self, tmp_path: Path) -> None:
 @skip_unless_feature("avif")
 class TestAvifAnimation:
     @contextmanager
-    def star_frames(self) -> Generator[list[ImageFile.ImageFile], None, None]:
+    def star_frames(self) -> Generator[list[Image.Image], None, None]:
         with Image.open("Tests/images/avif/star.png") as f:
             yield [f, f.rotate(90), f.rotate(180), f.rotate(270)]
 
@@ -636,8 +636,8 @@ def check(temp_file: str) -> None:
 
             # Test appending using a generator
             def imGenerator(
-                ims: list[ImageFile.ImageFile],
-            ) -> Generator[ImageFile.ImageFile, None, None]:
+                ims: list[Image.Image],
+            ) -> Generator[Image.Image, None, None]:
                 yield from ims
 
             temp_file2 = str(tmp_path / "temp_generator.avif")
diff --git a/src/PIL/AvifImagePlugin.py b/src/PIL/AvifImagePlugin.py
index 8125b548a06..dbce440eef9 100644
--- a/src/PIL/AvifImagePlugin.py
+++ b/src/PIL/AvifImagePlugin.py
@@ -45,7 +45,7 @@ def _accept(prefix: bytes) -> bool | str:
     return False
 
 
-def _get_default_max_threads():
+def _get_default_max_threads() -> int:
     if DEFAULT_MAX_THREADS:
         return DEFAULT_MAX_THREADS
     if hasattr(os, "sched_getaffinity"):