diff --git a/skimage/feature/__init__.py b/skimage/feature/__init__.py
index c067268a..eb98945c 100644
--- a/skimage/feature/__init__.py
+++ b/skimage/feature/__init__.py
@@ -1,5 +1,5 @@
 from ._hog import hog
-from .greycomatrix import greycomatrix, greycoprops
+from ._greycomatrix import greycomatrix, greycoprops
 from .peak import peak_local_max
 from ._harris import harris
 from .template import match_template
diff --git a/skimage/feature/greycomatrix.py b/skimage/feature/_greycomatrix.py
similarity index 99%
rename from skimage/feature/greycomatrix.py
rename to skimage/feature/_greycomatrix.py
index 5b2b92db..0926117b 100644
--- a/skimage/feature/greycomatrix.py
+++ b/skimage/feature/_greycomatrix.py
@@ -5,7 +5,7 @@ properties to characterize image textures.
 
 import numpy as np
 
-from ._greycomatrix import _glcm_loop
+from ._greycomatrix_cy import _glcm_loop
 
 
 def greycomatrix(image, distances, angles, levels=256, symmetric=False,
diff --git a/skimage/feature/_greycomatrix.pyx b/skimage/feature/_greycomatrix_cy.pyx
similarity index 100%
rename from skimage/feature/_greycomatrix.pyx
rename to skimage/feature/_greycomatrix_cy.pyx
diff --git a/skimage/feature/setup.py b/skimage/feature/setup.py
index 39358fd3..2c50a592 100644
--- a/skimage/feature/setup.py
+++ b/skimage/feature/setup.py
@@ -12,10 +12,10 @@ def configuration(parent_package='', top_path=None):
     config = Configuration('feature', parent_package, top_path)
     config.add_data_dir('tests')
 
-    cython(['_greycomatrix.pyx'], working_path=base_path)
+    cython(['_greycomatrix_cy.pyx'], working_path=base_path)
     cython(['_template.pyx'], working_path=base_path)
 
-    config.add_extension('_greycomatrix', sources=['_greycomatrix.c'],
+    config.add_extension('_greycomatrix_cy', sources=['_greycomatrix_cy.c'],
                          include_dirs=[get_numpy_include_dirs()])
     config.add_extension('_template', sources=['_template.c'],
                          include_dirs=[get_numpy_include_dirs()])
diff --git a/skimage/morphology/__init__.py b/skimage/morphology/__init__.py
index d639be1c..abc9986f 100644
--- a/skimage/morphology/__init__.py
+++ b/skimage/morphology/__init__.py
@@ -2,5 +2,5 @@ from .grey import *
 from .selem import *
 from .ccomp import label
 from .watershed import watershed, is_local_maximum
-from .skeletonize import skeletonize, medial_axis
+from ._skeletonize import skeletonize, medial_axis
 from .convex_hull import convex_hull_image
diff --git a/skimage/morphology/skeletonize.py b/skimage/morphology/_skeletonize.py
similarity index 99%
rename from skimage/morphology/skeletonize.py
rename to skimage/morphology/_skeletonize.py
index a8d31bdd..58842c6d 100644
--- a/skimage/morphology/skeletonize.py
+++ b/skimage/morphology/_skeletonize.py
@@ -5,7 +5,7 @@ Algorithms for computing the skeleton of a binary image
 import numpy as np
 from scipy import ndimage
 
-from ._skeletonize import _skeletonize_loop, _table_lookup_index
+from ._skeletonize_cy import _skeletonize_loop, _table_lookup_index
 
 # --------- Skeletonization by morphological thinning ---------
 
diff --git a/skimage/morphology/_skeletonize.pyx b/skimage/morphology/_skeletonize_cy.pyx
similarity index 100%
rename from skimage/morphology/_skeletonize.pyx
rename to skimage/morphology/_skeletonize_cy.pyx
diff --git a/skimage/morphology/setup.py b/skimage/morphology/setup.py
index fcf33f7f..2dd4a378 100644
--- a/skimage/morphology/setup.py
+++ b/skimage/morphology/setup.py
@@ -15,7 +15,7 @@ def configuration(parent_package='', top_path=None):
     cython(['ccomp.pyx'], working_path=base_path)
     cython(['cmorph.pyx'], working_path=base_path)
     cython(['_watershed.pyx'], working_path=base_path)
-    cython(['_skeletonize.pyx'], working_path=base_path)
+    cython(['_skeletonize_cy.pyx'], working_path=base_path)
     cython(['_pnpoly.pyx'], working_path=base_path)
     cython(['_convex_hull.pyx'], working_path=base_path)
 
@@ -25,7 +25,7 @@ def configuration(parent_package='', top_path=None):
                          include_dirs=[get_numpy_include_dirs()])
     config.add_extension('_watershed', sources=['_watershed.c'],
                          include_dirs=[get_numpy_include_dirs()])
-    config.add_extension('_skeletonize', sources=['_skeletonize.c'],
+    config.add_extension('_skeletonize_cy', sources=['_skeletonize_cy.c'],
                          include_dirs=[get_numpy_include_dirs()])
     config.add_extension('_pnpoly', sources=['_pnpoly.c'],
                          include_dirs=[get_numpy_include_dirs()])