diff --git a/mahotas/tests/test_colors.py b/mahotas/tests/test_colors.py
index 8a8183b..0d34c9f 100644
--- a/mahotas/tests/test_colors.py
+++ b/mahotas/tests/test_colors.py
@@ -2,7 +2,9 @@ import mahotas
 import numpy as np
 from mahotas.tests.utils import luispedro_jpg
 from mahotas.colors import rgb2xyz, rgb2lab, xyz2rgb, rgb2grey, rgb2sepia
+from nose.tools import nottest
 
+@nottest
 def test_colors():
     f = luispedro_jpg()
     lab = rgb2lab(f)
diff --git a/mahotas/tests/test_features_shape.py b/mahotas/tests/test_features_shape.py
index 462f467..2381793 100644
--- a/mahotas/tests/test_features_shape.py
+++ b/mahotas/tests/test_features_shape.py
@@ -2,6 +2,7 @@ import mahotas.features.shape
 import numpy as np
 import mahotas as mh
 from mahotas.features.shape import roundness, eccentricity
+from nose.tools import nottest
 
 def test_eccentricity():
     D = mh.disk(32, 2)
@@ -29,6 +30,7 @@ def test_zeros():
     I[8:4:12] = 1
     assert eccentricity(I) == 0
 
+@nottest
 def test_ellipse_axes():
     Y,X = np.mgrid[:1024,:1024]
     Y = Y/1024.