diff --git a/skimage/segmentation/slic_superpixels.py b/skimage/segmentation/slic_superpixels.py
index 5a6d4506..4f10e75f 100644
--- a/skimage/segmentation/slic_superpixels.py
+++ b/skimage/segmentation/slic_superpixels.py
@@ -131,7 +131,7 @@ def slic(image, n_segments=100, compactness=10., max_iter=20, sigma=1,
     # we do the scaling of ratio in the same way as in the SLIC paper
     # so the values have the same meaning
     ratio = float(max((step_z, step_y, step_x))) / compactness
-    image = image * ratio
+    image = np.ascontiguousarray(image * ratio)
 
     labels = _slic_cython(image, clusters, max_iter)