diff --git a/compact/definitions.xml b/compact/definitions.xml
index 4717f1fe37abbd617f1c374b342e9c1d5d369e56..892a7f2bf5ae9fc0dffcbeffd6ab6eb369e87d38 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -442,10 +442,11 @@
     -->
 
     <comment> Global parameters </comment>
-    <constant name="ffi_ZDC_width"             value="60.0 * cm"/>
+    <constant name="ffi_ZDC_width"             value="40.0 * cm"/>
     <constant name="ffi_ZDC_thickness"         value="200.0 * cm"/>
-    <comment> original ffi_ZDC_thickness </comment>	    
+    <comment> Original Global parameters </comment>	    
     <!--
+    <constant name="ffi_ZDC_width"             value="60.0 * cm"/>
     <constant name="ffi_ZDC_thickness"         value="250.0 * cm"/>
     -->	    
     <constant name="ffi_ZDC_ECAL_thickness"    value="30.0 * cm"/>