diff --git a/compact/definitions.xml b/compact/definitions.xml
index 8015150fa1f587cc9591e2e78aade5a9afafbeb7..caaac9ba5e42d50595b54e9f5b421923b14c0f09 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -344,7 +344,7 @@
       These are needed here to compute the dependent parameters.
     </comment>
 
-    <constant name="ForwardRICH_length"       value="1.1*m"/>
+    <constant name="ForwardRICH_length"       value="150.0*cm"/>
     <constant name="ForwardTRD_length"        value="10.0*cm"/>
     <constant name="ForwardTOF_length"        value="3.0*cm"/>