diff --git a/compact/definitions.xml b/compact/definitions.xml
index 3717a0d10ab65ffa05d2796618634f86a36513d1..e298dfc02013e428f877f61db75456d3b7f61551 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -626,12 +626,12 @@
 
     <constant name="ffi_ZDC_HCAL_offset"    value="5.0*mm"/>
     <constant name="ffi_ZDC_HCAL_st_length" value="20.0*mm"/>
-    <constant name="ffi_ZDC_HCAL_lt_length" value="ffi_ZDC_ECAL_width"/><comment> Changed from 40.0mm </comment>
+    <constant name="ffi_ZDC_HCAL_lt_length" value="ffi_ZDC_width"/><comment> Changed from 40.0mm </comment>
     <constant name="ffi_ZDC_HCAL_st_x_pos"  value="0.60*m"/>
     <constant name="ffi_ZDC_HCAL_st_y_pos"  value="0.0*m"/>
     <constant name="ffi_ZDC_HCAL_st_z_pos"  value="ffi_ZDC_z_pos + ffi_ZDC_ECAL_thickness + 1*cm"/> <comment> Was 34 m, changed to be placed right after ZDC(The ecal) </comment>
-    <constant name="ffi_ZDC_HCAL_lt_x_pos"  value="0.60*m"/>
-    <constant name="ffi_ZDC_HCAL_lt_y_pos"  value="ffi_ZDC_HCAL_offset + (ffi_ZDC_HCAL_st_length+ffi_ZDC_HCAL_lt_length)/sqrt(2)"/>
+    <constant name="ffi_ZDC_HCAL_lt_x_pos"  value="ffi_ZDC_x_pos"/>
+    <constant name="ffi_ZDC_HCAL_lt_y_pos"  value="ffi_ZDC_y_pos"/>
     <constant name="ffi_ZDC_HCAL_lt_z_pos"  value="ffi_ZDC_z_pos + ffi_ZDC_ECAL_thickness + 1*cm"/> <comment> Was 34 m, changed to be placed right after ZDC(The ecal) </comment>
 
     <comment>