diff --git a/bypy/macos/__main__.py b/bypy/macos/__main__.py
index c42f09d27..0f7fcffc4 100644
--- a/bypy/macos/__main__.py
+++ b/bypy/macos/__main__.py
@@ -113,6 +113,9 @@ def do_sign(app_dir):
             codesign(fw)
             items = set(os.listdir('.')) - fw
             codesign(expand_dirs(items))
+        # Sign kitty-tool
+        with current_dir('MacOS'):
+            codesign('kitty-tool')
 
     # Now sign the main app
     codesign(app_dir)