diff --git a/setup.py b/setup.py
old mode 100644
new mode 100755
index 8c1ecb54..6a476c21
--- a/setup.py
+++ b/setup.py
@@ -21,10 +21,14 @@ VERSION             = '0.10dev'
 PYTHON_VERSION      = (2, 5)
 DEPENDENCIES        = {
                         'numpy': (1, 6),
-                        'Cython': (0, 17),
                         'six': (1, 3),
                       }
 
+# Only require Cython if we have a developer checkout
+if VERSION.endswith('dev'):
+    DEPENDENCIES['Cython'] = (0, 17)
+
+
 
 import os
 import sys