diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index af1500c66..7ad965ab6 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -117,13 +117,13 @@ def test_g4_tiff_bytesio():
 def xtest_g4_tiff_fail(): # UNDONE fails badly, unknown reason
     """The 128x128 lena image fails for some reason. Investigating"""
 
-    Image.DEBUG = True
+    Image.DEBUG = 0
     file = "Tests/images/lena_g4.tif"
     im = Image.open(file)
 
     assert_equal(im.size, (128,128))
     _assert_noerr(im)
-    Image.DEBUG = False
+    Image.DEBUG = 0
         
 def test_g4_eq_png():
     """ Checking that we're actually getting the data that we expect"""
@@ -134,7 +134,7 @@ def test_g4_eq_png():
 
 def test_g4_write():
     """Checking to see that the saved image is the same as what we wrote"""
-    Image.DEBUG = True
+    Image.DEBUG = 0
 
     file = "Tests/images/lena_g4_500.tif"
     orig = Image.open(file)
@@ -151,4 +151,4 @@ def test_g4_write():
 
     assert_false(orig.tobytes() == reread.tobytes())
 
-    Image.DEBUG = False
+    Image.DEBUG = 0