diff --git a/ports/run/noux_tool_chain_auto.run b/ports/run/noux_tool_chain_auto.run
index f1db1be70..f62a7e518 100644
--- a/ports/run/noux_tool_chain_auto.run
+++ b/ports/run/noux_tool_chain_auto.run
@@ -28,9 +28,13 @@ source ${genode_dir}/ports/run/noux_tool_chain.inc
 
 append qemu_args " -m 768 "
 
-set time_start [ clock seconds ]
+# wait until Noux started
+run_genode_until {\[init -\> noux\].*--- noux started ---} 100
+set serial_id $spawn_id
 
-run_genode_until {child /bin/bash exited with exit value 234} 600 
+# start the measurement
+set time_start [ clock seconds ]
+run_genode_until {child /bin/bash exited with exit value 234} 400 $serial_id 
 
 set time_end [ clock seconds ]