diff --git a/lib/helper.py b/lib/helper.py
index cdb4293c..f0fbf82e 100644
--- a/lib/helper.py
+++ b/lib/helper.py
@@ -3,14 +3,13 @@
 
 
 def version_tuple(version):
-    return tuple(map(int, version.split('.')))
+    return tuple(map(int, version.split('.')))[:2]
 
 
 ''' This bit copied from PySCF '''
 def load_library(libname):
 # numpy 1.6 has bug in ctypeslib.load_library, see numpy/distutils/misc_util.py
-    if version_tuple(numpy.__version__) <= version_tuple('1.6.2'):
-    #if '1.6' in numpy.__version__:
+    if version_tuple(numpy.__version__) == version_tuple('1.6.2'):
         if (sys.platform.startswith('linux') or
             sys.platform.startswith('gnukfreebsd')):
             so_ext = '.so'