diff --git a/skimage/measure/block.py b/skimage/measure/block.py
index 5b68b588..aabd1a39 100644
--- a/skimage/measure/block.py
+++ b/skimage/measure/block.py
@@ -28,27 +28,25 @@ def block_reduce(image, block_size, func=np.sum, cval=0):
     --------
     >>> from skimage.measure import block_reduce
     >>> image = np.arange(3*3*4).reshape(3, 3, 4)
-    >>> image
+    >>> image # doctest: +NORMALIZE_WHITESPACE
     array([[[ 0,  1,  2,  3],
             [ 4,  5,  6,  7],
             [ 8,  9, 10, 11]],
-    <BLANKLINE>
            [[12, 13, 14, 15],
             [16, 17, 18, 19],
             [20, 21, 22, 23]],
-    <BLANKLINE>
            [[24, 25, 26, 27],
             [28, 29, 30, 31],
             [32, 33, 34, 35]]])
     >>> block_reduce(image, block_size=(3, 3, 1), func=np.mean)
     array([[[ 16.,  17.,  18.,  19.]]])
-    >>> block_reduce(image, block_size=(1, 3, 4), func=np.max)
+    >>> image_max1 = block_reduce(image, block_size=(1, 3, 4), func=np.max)
+    >>> image_max1 # doctest: +NORMALIZE_WHITESPACE
     array([[[11]],
-    <BLANKLINE>
            [[23]],
-    <BLANKLINE>
            [[35]]])
-    >>> block_reduce(image, block_size=(3, 1, 4), func=np.max)
+    >>> image_max2 = block_reduce(image, block_size=(3, 1, 4), func=np.max)
+    >>> image_max2 # doctest: +NORMALIZE_WHITESPACE
     array([[[27],
             [31],
             [35]]])