diff --git a/script/RefocusManipulatorScan.py b/script/RefocusManipulatorScan.py
index 50345be0..c7793282 100644
--- a/script/RefocusManipulatorScan.py
+++ b/script/RefocusManipulatorScan.py
@@ -12,7 +12,7 @@ import math
 # adjust the following parameters
 DISTANCE_X = 1.0 # mm
 #DISTANCE_Ry = 0.5 # mrad (Ry)
-SLOPE = -1.75 # mm/mrad (DX / DRy)
+SLOPE = 1.75 # mm/mrad (DX / DRy)
 STEPS = 50
 LATENCY = 0.0
 ENDSCAN = False