diff --git a/script/FocusYRotScan.py b/script/FocusYRotScan.py
index f5997b26..6942dbd1 100644
--- a/script/FocusYRotScan.py
+++ b/script/FocusYRotScan.py
@@ -28,7 +28,7 @@ def trig_sensors():
     caput("X03DA-OP-10ADC:TRG.PROC", 1)
     
 try:
-    lscan(MOTORS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, RELATIVE, before_read=before_readout, after_read = after_readout)
+    lscan(MOTORS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, RELATIVE, before_read=trig_sensors, after_read = after_readout)
 finally:
     if ENDSCAN:
         after_scan()