diff --git a/compact/tof_barrel.xml b/compact/tof_barrel.xml
index 9ac60144de5b41700a29ee89a0cb92260f04f37f..36967fa086552f75f3c81d6c5c412ba02295ccb0 100644
--- a/compact/tof_barrel.xml
+++ b/compact/tof_barrel.xml
@@ -121,9 +121,9 @@
                   z0="(BarrelTOFTotalLength - BarrelTOFModuleLength)/2"
                   nz="BarrelTOFModulesNZ"/>-->
       <layer module="UFSD" id="8" vis="SiVertexVis">
-        <barrel_envelope inner_r="(VertexTrackerRadius7+VertexTrackerRadius8)/2"
-                         outer_r="VertexTrackerRadius8+5*mm" z_length="VertexTrackerBarrel_length"/>
-        <rphi_layout phi_tilt="10.0*degree" nphi="VertexTrackerNModules8" phi0="0.0" rc="VertexTrackerRadius8" dr="0.0 * mm"/>
+        <barrel_envelope inner_r="BarrelTOFRadius"
+                         outer_r="BarrelTOFRadius + 30.0*mm" z_length="BarrelTOFTotalLength"/>
+        <rphi_layout phi_tilt="10.0*degree" nphi="BarrelTOFModulesNPhi" phi0="0.0" rc="BarrelTOFRadius + 10.0 * mm" dr="0.0 * mm"/>
         <z_layout dr="0.0 * mm" z0="0.0 * mm" nz="1"/>
       </layer>
     </detector>