diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index bf0dec4b8..52fc9239c 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -181,7 +181,7 @@ class TestFileJpeg:
         assert test(100, 200) == (100, 200)
         assert test(0) is None  # square pixels
 
-    def test_dpi_jfif_cm(self):
+    def test_dpi_jfif_cm(self) -> None:
         with Image.open("Tests/images/jfif_unit_cm.jpg") as im:
             assert im.info["dpi"] == (2.54, 5.08)
 
diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 61eb15243..93ad89032 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -949,7 +949,7 @@ class ImageFileDirectory_v2(_IFDv2Base):
             warnings.warn(str(msg))
             return
 
-    def _get_ifh(self):
+    def _get_ifh(self) -> bytes:
         ifh = self._prefix + self._pack("H", 43 if self._bigtiff else 42)
         if self._bigtiff:
             ifh += self._pack("HH", 8, 0)