diff --git a/compact/tof_barrel.xml b/compact/tof_barrel.xml
index 56dd1d98d72297e9807173c8f781363256d80ef4..33c8d32b090bb9153e9d6e43dde5bd3de1afb48f 100644
--- a/compact/tof_barrel.xml
+++ b/compact/tof_barrel.xml
@@ -2,7 +2,7 @@
 <lccdd>
   <define>
 
-      <constant name="BarrelTOFRadius"         value="45*cm"/>
+      <constant name="BarrelTOFRadius"         value=" 45*cm"/>
       <constant name="BarrelTOFTotalLength"    value="120*cm"/>
       <constant name="BarrelTOFTotalThickness" value="10*mm"/>
       <constant name="BarrelTOFModulesNPhi"    value="30"/>