diff --git a/skimage/transform/_geometric.py b/skimage/transform/_geometric.py
index a44a5eb5..2e5d5e2b 100644
--- a/skimage/transform/_geometric.py
+++ b/skimage/transform/_geometric.py
@@ -1002,6 +1002,7 @@ def _convert_warp_input(image, keep_range):
     else:
         if image.dtype == np.double:
             image = rescale_intensity(image)
+            image = np.atleast_2d(image)
         else:
             image = img_as_float(image)
     return image