diff --git a/script/test/otf_post_mortem.py b/script/test/otf_post_mortem.py
index 3a94fdb..476ed82 100644
--- a/script/test/otf_post_mortem.py
+++ b/script/test/otf_post_mortem.py
@@ -38,7 +38,7 @@ while loop_count < nr_loops:
 # scans O
 caput('X11MA-KEI10:RANGE', 7)
 caput('X11MA-KEI11:RANGE', 8)
-caput('X11MA-KEI12:RANGE', 10)
+caput('X11MA-KEI12:RANGE', 9)
 nr_loops=2
 loop_count = 0
 while loop_count < nr_loops: