diff --git a/skimage/measure/__init__.py b/skimage/measure/__init__.py
index 1c92d9ee..226c4235 100755
--- a/skimage/measure/__init__.py
+++ b/skimage/measure/__init__.py
@@ -1,4 +1,11 @@
 from .find_contours import find_contours
 from ._regionprops import regionprops, perimeter
 from ._structural_similarity import structural_similarity
-from ._polygon import approximate_polygon, subdivide_polygon
\ No newline at end of file
+from ._polygon import approximate_polygon, subdivide_polygon
+
+__all__ = ['find_contours',
+           'regionprops',
+           'perimeter',
+           'structural_similarity',
+           'approximate_polygon',
+           'subdivide_polygon']