diff --git a/Mac/Extras.install.py b/Mac/Extras.install.py
index ab1af71dfd823f..fa2e2f1149b567 100644
--- a/Mac/Extras.install.py
+++ b/Mac/Extras.install.py
@@ -9,10 +9,8 @@
 debug = 0
 
 def isclean(name):
-    if name == 'CVS': return 0
-    if name == '.cvsignore': return 0
-    if name == '.DS_store': return 0
-    if name == '.svn': return 0
+    if name in ('CVS', '.cvsignore', '.DS_store', '.DS_Store', '.svn'):
+        return 0
     if name.endswith('~'): return 0
     if name.endswith('.BAK'): return 0
     if name.endswith('.pyc'): return 0