diff --git a/skimage/morphology/skel.py b/skimage/morphology/skel.py
index eff1e56c..2da3979e 100644
--- a/skimage/morphology/skel.py
+++ b/skimage/morphology/skel.py
@@ -36,7 +36,7 @@ def _postprocess_image(img_o):
 
 def compute_thin_image(img_in):
     img = _prepare_image(img_in)
-    img = _compute_thin_image(img)
+    img = np.asarray(_compute_thin_image(img))
     img = _postprocess_image(img)
     return img
 
diff --git a/skimage/morphology/tests/data/bat/bat-cochlea-volume.tif b/skimage/morphology/tests/data/bat/bat-cochlea-volume.tif
new file mode 100644
index 00000000..0613f1e7
Binary files /dev/null and b/skimage/morphology/tests/data/bat/bat-cochlea-volume.tif differ
diff --git a/skimage/morphology/tests/data/bat/bat-cochlea-volume_fiji.tif b/skimage/morphology/tests/data/bat/bat-cochlea-volume_fiji.tif
new file mode 100644
index 00000000..e6ce0122
Binary files /dev/null and b/skimage/morphology/tests/data/bat/bat-cochlea-volume_fiji.tif differ
diff --git a/skimage/morphology/tests/test_skeletonize_3d.py b/skimage/morphology/tests/test_skeletonize_3d.py
index 4bd48af7..985a5bde 100644
--- a/skimage/morphology/tests/test_skeletonize_3d.py
+++ b/skimage/morphology/tests/test_skeletonize_3d.py
@@ -25,6 +25,11 @@ def test_simple_3d():
     for fname in ['3/stack', '4/stack']:
         yield check_skel_3d, fname
 
+# 'slow' test: Bat Cochlea from FIJI collections.
+def test_large():
+    for fname in ['bat/bat-cochlea-volume',]:
+        yield check_skel_3d, fname
+
 
 def get_data_path():
     # XXX this is a bad temp hack