diff --git a/site_ansto/instrument/emu/config/motors/motor_configuration.tcl b/site_ansto/instrument/emu/config/motors/motor_configuration.tcl
index dddd2696..d7ab4d35 100644
--- a/site_ansto/instrument/emu/config/motors/motor_configuration.tcl
+++ b/site_ansto/instrument/emu/config/motors/motor_configuration.tcl
@@ -1,2 +1,4 @@
 # @file Loads the generated_motor_configuration.tcl file which is created by util/genmotconf.tcl from CSV files.
 fileeval config/motors/generated_motor_configuration.tcl
+# NOTE: mchi will collide with guide if it is driving to the limit switch position.
+mchi hardupperlim [expr [SplitReply [mchi hardupperlim]] - 1.0]