diff --git a/scripts/ost_startup.py b/scripts/ost_startup.py
index 92e210ff6c15c725a517b9a2f9f6834819cc5186..6671b51643e299cb81645fa9707ae4a714bb3d95 100644
--- a/scripts/ost_startup.py
+++ b/scripts/ost_startup.py
@@ -28,7 +28,7 @@ parser.disable_interspersed_args()
 
 _site_packs='python%d.%d/site-packages' % sys.version_info[0:2]
 _base_dir=os.getenv('DNG_ROOT')
-if platform.machine()=='x86_64':
+if platform.machine()=='x86_64' and platform.system()!='Darwin' :
   sys.path.insert(0, os.path.join(_base_dir, 'lib64', _site_packs))
 else:
   sys.path.insert(0,os.path.join(_base_dir, 'lib', _site_packs))