diff --git a/skimage/morphology/grey.py b/skimage/morphology/grey.py
index dc34d3d6..a7959bb6 100644
--- a/skimage/morphology/grey.py
+++ b/skimage/morphology/grey.py
@@ -57,7 +57,7 @@ def erosion(image, selem, out=None, shift_x=False, shift_y=False):
            [0, 0, 0, 0, 0],
            [0, 0, 1, 0, 0],
            [0, 0, 0, 0, 0],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
 
@@ -109,7 +109,7 @@ def dilation(image, selem, out=None, shift_x=False, shift_y=False):
            [0, 1, 1, 1, 0],
            [0, 1, 1, 1, 0],
            [0, 1, 1, 1, 0],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
 
@@ -158,7 +158,7 @@ def opening(image, selem, out=None):
            [1, 1, 0, 1, 1],
            [1, 1, 0, 1, 1],
            [1, 1, 0, 1, 1],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
 
@@ -208,7 +208,7 @@ def closing(image, selem, out=None):
            [0, 0, 0, 0, 0],
            [1, 1, 1, 1, 1],
            [0, 0, 0, 0, 0],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
 
@@ -257,7 +257,7 @@ def white_tophat(image, selem, out=None):
            [0, 0, 1, 0, 0],
            [0, 1, 5, 1, 0],
            [0, 0, 1, 0, 0],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
    """
     if image is out:
@@ -306,7 +306,7 @@ def black_tophat(image, selem, out=None):
            [0, 0, 1, 0, 0],
            [0, 1, 5, 1, 0],
            [0, 0, 1, 0, 0],
-           [0, 0, 0, 0, 0]], dtype='uint8')
+           [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
 
diff --git a/skimage/morphology/watershed.py b/skimage/morphology/watershed.py
index c0b1b34b..8a08fafc 100644
--- a/skimage/morphology/watershed.py
+++ b/skimage/morphology/watershed.py
@@ -261,7 +261,7 @@ def is_local_maximum(image, labels=None, footprint=None):
     array([[ True, False, False, False],
            [ True, False,  True, False],
            [ True, False, False, False],
-           [ True,  True, False,  True]], dtype='bool')
+           [ True,  True, False,  True]], dtype=bool)
     >>> image = np.arange(16).reshape((4, 4))
     >>> labels = np.array([[1, 2], [3, 4]])
     >>> labels = np.repeat(np.repeat(labels, 2, axis=0), 2, axis=1)
@@ -279,7 +279,7 @@ def is_local_maximum(image, labels=None, footprint=None):
     array([[False, False, False, False],
            [False,  True, False,  True],
            [False, False, False, False],
-           [False,  True, False,  True]], dtype='bool')
+           [False,  True, False,  True]], dtype=bool)
     """
     if labels is None:
         labels = np.ones(image.shape, dtype=np.uint8)