diff --git a/plugins/osx/osx.plugin.zsh b/plugins/osx/osx.plugin.zsh
index 51cd7c143..cf562d1c9 100644
--- a/plugins/osx/osx.plugin.zsh
+++ b/plugins/osx/osx.plugin.zsh
@@ -157,3 +157,7 @@ function trash() {
 function vncviewer() {
   open vnc://$@
 }
+
+function lock() {
+    open -a ScreenSaverEngine
+}