diff --git a/uname b/uname
index 0e12a9a..e8863d6 100755
--- a/uname
+++ b/uname
@@ -1,6 +1,7 @@
 #!/bin/sh
 # uname(1) simulator, inspired by Pavel Roskin.
 
+[ $# -ne 1 ] && exec sh $0 -s
 [ $1 = -m ] && echo ia64 && exit 0
 [ $1 = -r ] && echo B.11.20 && exit 0
 [ $1 = -s ] && echo HP-UX && exit 0