diff --git a/skimage/morphology/binary.py b/skimage/morphology/binary.py
index d5e0d92b..5b019051 100644
--- a/skimage/morphology/binary.py
+++ b/skimage/morphology/binary.py
@@ -31,11 +31,11 @@ def binary_erosion(image, selem=None, out=None):
         The result of the morphological erosion with values in ``[0, 1]``.
 
     """
-    
+
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     selem = (selem != 0)
     selem_sum = np.sum(selem)
 
@@ -80,11 +80,11 @@ def binary_dilation(image, selem=None, out=None):
         The result of the morphological dilation with values in ``[0, 1]``.
 
     """
-    
+
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     selem = (selem != 0)
 
     if np.sum(selem) <= 255:
diff --git a/skimage/morphology/grey.py b/skimage/morphology/grey.py
index e50e1460..2b4a01a8 100644
--- a/skimage/morphology/grey.py
+++ b/skimage/morphology/grey.py
@@ -59,7 +59,7 @@ def erosion(image, selem=None, out=None, shift_x=False, shift_y=False):
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     if image is out:
         raise NotImplementedError("In-place erosion not supported!")
     image = img_as_ubyte(image)
@@ -117,7 +117,7 @@ def dilation(image, selem=None, out=None, shift_x=False, shift_y=False):
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-    
+
     if image is out:
         raise NotImplementedError("In-place dilation not supported!")
     image = img_as_ubyte(image)
@@ -168,11 +168,11 @@ def opening(image, selem=None, out=None):
            [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
-    
+
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     h, w = selem.shape
     shift_x = True if (w % 2) == 0 else False
     shift_y = True if (h % 2) == 0 else False
@@ -228,7 +228,7 @@ def closing(image, selem=None, out=None):
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-    
+
     h, w = selem.shape
     shift_x = True if (w % 2) == 0 else False
     shift_y = True if (h % 2) == 0 else False
@@ -279,11 +279,11 @@ def white_tophat(image, selem=None, out=None):
            [0, 0, 0, 0, 0]], dtype=uint8)
 
     """
-   
+
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     if image is out:
         raise NotImplementedError("Cannot perform white top hat in place.")
 
@@ -338,7 +338,7 @@ def black_tophat(image, selem=None, out=None):
     # Default structure element
     if selem is None:
         selem = _default_selem(image.ndim)
-        
+
     if image is out:
         raise NotImplementedError("Cannot perform white top hat in place.")
 
diff --git a/skimage/morphology/selem.py b/skimage/morphology/selem.py
index 24adfce6..4147d93b 100644
--- a/skimage/morphology/selem.py
+++ b/skimage/morphology/selem.py
@@ -292,7 +292,7 @@ def star(a, dtype=np.uint8):
     selem[selem > 0] = 1
     return selem.astype(dtype)
 
-    
+
 def _default_selem(ndim):
     """
     Generates a cross-shaped structuring element (connectivity=1). This is the
diff --git a/skimage/morphology/tests/test_binary.py b/skimage/morphology/tests/test_binary.py
index e6d80321..6ac5e8d8 100644
--- a/skimage/morphology/tests/test_binary.py
+++ b/skimage/morphology/tests/test_binary.py
@@ -65,10 +65,8 @@ def test_out_argument():
         testing.assert_array_equal(out, func(img, strel))
 
 def test_default_selem():
-
     functions = [binary.binary_erosion, binary.binary_dilation,
                  binary.binary_opening, binary.binary_closing]
-                 
     strel = selem.diamond(radius=1)
     image = np.array([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
@@ -83,11 +81,10 @@ def test_default_selem():
                       [0, 0, 1, 1, 1, 1, 1, 1, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]], np.uint8)
-                      
     for function in functions:
         im_expected = function(image, strel)
         im_test = function(image)
         yield testing.assert_array_equal, im_expected, im_test
-    
+
 if __name__ == '__main__':
     testing.run_module_suite()
diff --git a/skimage/morphology/tests/test_grey.py b/skimage/morphology/tests/test_grey.py
index d298b1eb..359a2832 100644
--- a/skimage/morphology/tests/test_grey.py
+++ b/skimage/morphology/tests/test_grey.py
@@ -120,11 +120,9 @@ class TestEccentricStructuringElements():
             assert np.all(tophat == 0)
 
 def test_default_selem():
-
     functions = [grey.erosion, grey.dilation,
                  grey.opening, grey.closing,
                  grey.white_tophat, grey.black_tophat]
-                 
     strel = selem.diamond(radius=1)
     image = np.array([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
@@ -139,13 +137,11 @@ def test_default_selem():
                       [0, 0, 1, 1, 1, 1, 1, 1, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]], np.uint8)
-                      
     for function in functions:
         im_expected = function(image, strel)
         im_test = function(image)
         yield testing.assert_array_equal, im_expected, im_test
-            
-            
+
 class TestDTypes():
 
     def setUp(self):