diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 73a3fff15..07e7e5385 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -255,22 +255,22 @@ def test_save_icc_profile_none():
     # check saving files with an ICC profile set to None (omit profile)
     in_file = "Tests/images/icc_profile_none.png"
     im = Image.open(in_file)
-    assert im.info['icc_profile'] is None
+    assert_equal(im.info['icc_profile'], None)
 
-    file = tempfile("temp.png")
-    assert_no_exception(lambda: im.save(file))
-    im = Image.open(file)
-    assert 'icc_profile' not in im.info
+    f = tempfile("temp.png")
+    assert_no_exception(lambda: im.save(f))
+    im = Image.open(f)
+    assert_false('icc_profile' in im.info)
 
 def test_save_icc_profile_exists():
     # check icc profile is kept during save()
     in_file = "Tests/images/trollface.png"
     im = Image.open(in_file)
     orig_profile = im.info['icc_profile']
-    assert len(orig_profile) == 6636
+    assert_equal(len(orig_profile), 6636)
 
-    file = tempfile("temp.png")
-    assert_no_exception(lambda: im.save(file))
+    f = tempfile("temp.png")
+    assert_no_exception(lambda: im.save(f))
 
-    im = Image.open(file)
-    assert im.info['icc_profile'] == orig_profile
+    im = Image.open(f)
+    assert_equal(im.info['icc_profile'], orig_profile)