diff --git a/updater.py b/updater.py
index 03eaf5e..2960d5c 100644
--- a/updater.py
+++ b/updater.py
@@ -150,7 +150,7 @@ class updateThread(QtCore.QThread):
                 path = sys.argv[0]
                 if platform.system() == "Darwin":
                     path = Cocoa.NSBundle.mainBundle().bundlePath()
-                    os.chdir(os.path.splitext(path)[0]) # right next to the .app package
+                    os.chdir(os.path.split(path)[0]) # right next to the .app package
 
                 updatezip = "update" + os.path.splitext(filename)[1]
                 if not os.path.exists(updatezip):