diff --git a/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl b/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
index 7d30e293..43260099 100644
--- a/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
+++ b/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
@@ -119,7 +119,7 @@ namespace eval ::scobj::chopper {
     variable fermiPath
     set fermiPath /sics/fermi_chopper
     ::scobj::hinitprops fermi_chopper
-    set sim_mode [SplitReply chopper_simulation]
+    set sim_mode [SplitReply [chopper_simulation]]
     if {$sim_mode == "false"} {
       set host [dict get $::CHOPPER_HOSTPORT MB350PC HOST]
       set port [dict get $::CHOPPER_HOSTPORT MB350PC PORT]