diff --git a/ndiff/scripts/ndiff b/ndiff/scripts/ndiff
index 07fe8ccc9..05945fba1 100755
--- a/ndiff/scripts/ndiff
+++ b/ndiff/scripts/ndiff
@@ -61,7 +61,7 @@ def is_secure_dir(path, num_symlinks=0):
 # Add the install_lib directory to sys.path, the list of directories searched
 # for modules, but don't do it if the directory or its parents may be writable
 # by other users. The following line is replaced by the installation program.
-INSTALL_LIB = '/usr/local/lib/python2.7/site-packages/'
+INSTALL_LIB = None
 if INSTALL_LIB is not None and is_secure_dir(INSTALL_LIB):
     sys.path.append(INSTALL_LIB)