diff --git a/cps/updater.py b/cps/updater.py
index fb5219b6..dd81c839 100644
--- a/cps/updater.py
+++ b/cps/updater.py
@@ -185,7 +185,7 @@ class Updater(threading.Thread):
     def moveallfiles(cls, root_src_dir, root_dst_dir):
         new_permissions = os.stat(root_dst_dir)
         log.debug('Performing Update on OS-System: %s', sys.platform)
-        change_permissions = (sys.platform == "win32" or sys.platform == "darwin")
+        change_permissions = not (sys.platform == "win32" or sys.platform == "darwin")
         for src_dir, __, files in os.walk(root_src_dir):
             dst_dir = src_dir.replace(root_src_dir, root_dst_dir, 1)
             if not os.path.exists(dst_dir):