diff --git a/ip6/far_forward_ZDC_Ecal_WSciFi.xml b/ip6/far_forward_ZDC_Ecal_WSciFi.xml
index ae885870e055e5b3f4c192dba7657bcdbe5d18da..0a80c55fe4eda9502460c7822c6afb197065fa22 100644
--- a/ip6/far_forward_ZDC_Ecal_WSciFi.xml
+++ b/ip6/far_forward_ZDC_Ecal_WSciFi.xml
@@ -23,7 +23,7 @@
       <rotation x="ffi_ZDC_ECAL_rotateX_angle" y="ffi_ZDC_ECAL_rotateY_angle" z="ffi_ZDC_ECAL_rotateZ_angle"/>
       <dimensions x="ffi_ZDC_ECAL_width" z="ffi_ZDC_ECAL_length"/>
       <module sizex="25*mm" sizey="25*mm" sizez="170*mm" material="WSciFi_UCLA_Abs" vis="ffi_ZDC_ECAL_module_Vis">
-        <fiber material="PlasticScint"
+        <fiber material="Polystyrene"
           radius="ffi_ZDC_ECAL_FiberRadius"
           offset="ffi_ZDC_ECAL_FiberOffset"
           spacex="ffi_ZDC_ECAL_FiberSpaceX"