diff --git a/setup.py b/setup.py
index 18ff050ee6c4..ff7614794ab8 100644
--- a/setup.py
+++ b/setup.py
@@ -258,6 +258,7 @@
 
           # List third-party Python packages that we require
           install_requires=install_requires,
+          setup_requires=setup_requires,
 
           # matplotlib has C/C++ extensions, so it's not zip safe.
           # Telling setuptools this prevents it from doing an automatic
diff --git a/setupext.py b/setupext.py
index 0a8b78c5a92b..bc17b3567574 100644
--- a/setupext.py
+++ b/setupext.py
@@ -711,7 +711,11 @@ class Numpy(SetupPackage):
 
     @staticmethod
     def include_dirs_hook():
+        import __builtin__
+        if hasattr(__builtin__, '__NUMPY_SETUP__'):
+            del __builtin__.__NUMPY_SETUP__
         import numpy
+        reload(numpy)
 
         ext = Extension('test', [])
         ext.include_dirs.append(numpy.get_include())