diff --git a/Tests/test_decompression_bomb.py b/Tests/test_decompression_bomb.py
index 62bca6d10..5ce83f44c 100644
--- a/Tests/test_decompression_bomb.py
+++ b/Tests/test_decompression_bomb.py
@@ -48,7 +48,7 @@ class TestDecompressionCrop(PillowTestCase):
 
     def setUp(self):
         self.src = hopper()
-        Image.MAX_IMAGE_PIXELS = self.src.height * self.src.width
+        Image.MAX_IMAGE_PIXELS = self.src.height * self.src.width * 4 - 1
 
     def tearDown(self):
         Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT