diff --git a/Detector/DetCRD/compact/CRD_common_v01/DC_Simple_v01_01.xml b/Detector/DetCRD/compact/CRD_common_v01/DC_Simple_v01_01.xml
index 6a533eb7243374990cda31b3549f3920925744ef..8dd7602c1e415b63b47d6d52a7b9a22556926380 100644
--- a/Detector/DetCRD/compact/CRD_common_v01/DC_Simple_v01_01.xml
+++ b/Detector/DetCRD/compact/CRD_common_v01/DC_Simple_v01_01.xml
@@ -47,7 +47,7 @@
     <constant name="DC_inner_chamber_enabled" value="1"/>
     <constant name="DC_outer_chamber_enabled" value="1"/>
 
-    <constant name="Safe_distance" value="0.02*mm"/>
+    <constant name="DC_safe_distance" value="0.02*mm"/>
 
   </define>