diff --git a/src/fabio/test/codecs/test_esperantoimage.py b/src/fabio/test/codecs/test_esperantoimage.py
index c5d9aa5c..b86c9492 100644
--- a/src/fabio/test/codecs/test_esperantoimage.py
+++ b/src/fabio/test/codecs/test_esperantoimage.py
@@ -134,7 +134,7 @@ def test_data(self):
     def test_values(self):
         esp = fabio.open(UtilsTest.getimage("reference.esperanto.bz2")[:-4])
         npy = fabio.open(UtilsTest.getimage("reference.npy.bz2")[:-4])
-        self.assertEqual(numpy.all(esp.data == npy.data), True, "Images are the same")
+        self.assertTrue(numpy.array_equal(esp.data, npy.data), "Images are the same")
 
 
 def suite():