diff --git a/script/optics/ExitSlitYScan.py b/script/optics/ExitSlitYScan.py
index 633fb2d2..010d94a4 100644
--- a/script/optics/ExitSlitYScan.py
+++ b/script/optics/ExitSlitYScan.py
@@ -8,9 +8,9 @@ set keithleys manuall to free run!
 
 POSITIONERS = (ExitSlitY)
 SENSORS = (SampleCurrent,RefCurrent, MachineCurrent)
-STARTPOS = (-0.5)
-ENDPOS = (1.0)
-STEPS = 0.01
+STARTPOS = (1.0)
+ENDPOS = (-0.5)
+STEPS = -0.01
 LATENCY = 0.1
 DWELL = 1.0