diff --git a/demo/kill-on-timeout.should b/demo/kill-on-timeout.should
index 7688c3234640878a89d2ee3182c1d26e0dc01212..7ebc4f968c251191efb88858c92653818a0f39db 100644
--- a/demo/kill-on-timeout.should
+++ b/demo/kill-on-timeout.should
@@ -1,7 +1,10 @@
 # when task takes too many time it should be killed by should.py
 
+!EXIT_CODE: 1
 ./should --timeout 1 demo/tests/timeout.should
+
 # Check that the script is not running anymore
+!EXIT_CODE: 0
 ps awux | grep  'seq 1 10.*sleep' | grep -v grep || echo "not found"
 
 $ The task must time out