diff --git a/publish.py b/publish.py
index 20e082760..a88e30692 100755
--- a/publish.py
+++ b/publish.py
@@ -154,7 +154,7 @@ def run_website(args: Any) -> None:
         f.write(version)
     shutil.copy2(os.path.join(docs_dir, 'installer.sh'), publish_dir)
     os.chdir(os.path.dirname(publish_dir))
-    subprocess.check_call(['optipng', '-o7', 'kitty/_images/social_previews/*.png'])
+    subprocess.check_call(['optipng', '-o7'] + glob.glob('kitty/_images/social_previews/*.png'))
     subprocess.check_call(['git', 'add', 'kitty'])
     subprocess.check_call(['git', 'commit', '-m', 'kitty website updates'])
     subprocess.check_call(['git', 'push'])