diff --git a/site_ansto/instrument/pelican/config/motors/motor_configuration.tcl b/site_ansto/instrument/pelican/config/motors/motor_configuration.tcl
index 7ea35cef..1df78c9c 100644
--- a/site_ansto/instrument/pelican/config/motors/motor_configuration.tcl
+++ b/site_ansto/instrument/pelican/config/motors/motor_configuration.tcl
@@ -208,7 +208,7 @@ pom creep_precision 0.0215
 
 # mc1: Sample/Detector Chamber Rotation (Detector)
 #set stthStepRate 66807.314
-set stthStepRate [expr { 0.5 * 25000 * 400.0 * (2 * 1800.0 / 400.0) / 360.0 }]
+set stthStepRate [expr { 25000 * 400.0 * (2 * 1800.0 / 400.0) / 360.0 }]
 
 Motor stth $motor_driver_type [params \
   asyncqueue mc1\