diff --git a/plugins/osx/osx.plugin.zsh b/plugins/osx/osx.plugin.zsh
index 81eed5e92..a4389b8b4 100644
--- a/plugins/osx/osx.plugin.zsh
+++ b/plugins/osx/osx.plugin.zsh
@@ -55,3 +55,7 @@ end do_submenu
 do_submenu("iTerm", "Shell", "New Tab")
 EOF
 }
+
+function lock() {
+    open -a ScreenSaverEngine
+}