diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 4ddde047a9e..6339d878acd 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -82,7 +82,7 @@ def test_g4_tiff_bytesio(self):
         self._assert_noerr(im)
 
     def test_g4_non_disk_file_object(self):
-        """Testing loading from non-disk non-bytesio file object"""
+        """Testing loading from non-disk non-BytesIO file object"""
         test_file = "Tests/images/hopper_g4_500.tif"
         s = io.BytesIO()
         with open(test_file, "rb") as f: