diff --git a/bypy/macos/sign.py b/bypy/macos/sign.py
index c2ba8efbfd..87279d74c1 100644
--- a/bypy/macos/sign.py
+++ b/bypy/macos/sign.py
@@ -102,4 +102,4 @@ def sign_app(appdir, notarize):
     with make_certificate_useable():
         do_sign_app(appdir)
         if notarize:
-            notarize_app(appdir)
+            notarize_app(appdir, 'calibre')