diff --git a/qubes4-multi-update b/qubes4-multi-update
index d376c52..722c16d 100755
--- a/qubes4-multi-update
+++ b/qubes4-multi-update
@@ -171,7 +171,7 @@ def main(args=None, app=None):
             break
 
     if options.shutdown_all:
-        subprocess.check_call(["qvm-shutdown", "--all", "--wait", "--wait-time=40"])
+        subprocess.check_call(["qvm-shutdown", "--all", "--wait", "--timeout=40"])
 
 
     print("\nEnd of Multi-Update process.")