diff --git a/python/caffe/io.py b/python/caffe/io.py
index fc96266085f..0cad7211291 100644
--- a/python/caffe/io.py
+++ b/python/caffe/io.py
@@ -329,7 +329,7 @@ def resize_image(im, new_dims, interp_order=1):
             return ret
     else:
         # ndimage interpolates anything but more slowly.
-        scale = tuple(np.array(new_dims) / np.array(im.shape[:2]))
+        scale = tuple(np.array(new_dims, dtype=float) / np.array(im.shape[:2]))
         resized_im = zoom(im, scale + (1,), order=interp_order)
     return resized_im.astype(np.float32)