diff --git a/compact/tof_barrel.xml b/compact/tof_barrel.xml
index d8b3bd12e7ba6c00b26bcfd0ac31f2eea30c4145..04597e0c2083a5a2411ccef981116408538a97d8 100644
--- a/compact/tof_barrel.xml
+++ b/compact/tof_barrel.xml
@@ -14,7 +14,7 @@
     </comment>
     <constant name="BarrelTOFLayer_rOffset"     value="0.5*cm"/>
 
-    <constant name="BarrelTOF_rmin1"       value="52.0*cm"/>
+    <constant name="BarrelTOF_rmin1"       value="50.0*cm"/>
     <constant name="BarrelTOF_rmin2"       value="BarrelTOF_rmin1 + BarrelTOFSpaceFrame_width"/>
     <constant name="BarrelTOF_length1"     value="105.0*cm"/>
     <constant name="BarrelTOF_length2"     value="114.0*cm"/>