diff --git a/skimage/transform/tests/test_radon_transform.py b/skimage/transform/tests/test_radon_transform.py
index 7f517801..5eef1e1c 100644
--- a/skimage/transform/tests/test_radon_transform.py
+++ b/skimage/transform/tests/test_radon_transform.py
@@ -241,11 +241,17 @@ def check_sinogram_circle_to_square(size):
     image = _random_circle((size, size))
     theta = np.linspace(0., 180., size, False)
     sinogram_circle = radon(image, theta, circle=True)
+    argmax_shape = lambda a: np.unravel_index(np.argmax(a), a.shape)
+    print('\n\targmax of circle:', argmax_shape(sinogram_circle))
     sinogram_square = radon(image, theta, circle=False)
+    print('\targmax of square:', argmax_shape(sinogram_square))
     sinogram_circle_to_square = _sinogram_circle_to_square(sinogram_circle)
+    print('\targmax of circle to square:',
+          argmax_shape(sinogram_circle_to_square))
     error = abs(sinogram_square - sinogram_circle_to_square)
     print(np.mean(error), np.max(error))
-    assert np.allclose(sinogram_square, sinogram_circle_to_square)
+    assert (argmax_shape(sinogram_square)
+            == argmax_shape(sinogram_circle_to_square))
 
 
 def test_sinogram_circle_to_square():