diff --git a/skimage/transform/tests/test_warps.py b/skimage/transform/tests/test_warps.py
index a18ad492..c84d57fe 100644
--- a/skimage/transform/tests/test_warps.py
+++ b/skimage/transform/tests/test_warps.py
@@ -246,7 +246,6 @@ def test_downscale_local_mean():
 
 
 def test_invalid():
-    assert_raises(ValueError, warp, np.ones((4, )), SimilarityTransform())
     assert_raises(ValueError, warp, np.ones((4, 3, 3, 3)),
                   SimilarityTransform())