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 ead87a0e6d4ab5255e3f9baeb66a28ab7efbefa1..e6e7e8b8d3fc0e73b70867f470ca4cfc8c39e007 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
@@ -57,6 +57,7 @@
 
   <detectors>
     <detector id="DetID_DC" name="DriftChamber" type="DriftChamber" readout="DriftChamberHitsCollection" vis="VisibleBlue" sensitive="true" region="DriftChamberRegion" limits="DC_limits">
+      <chamber id="0"/>
       <envelope vis="SeeThrough">
         <shape type="BooleanShape" operation="Union" material="Air">
           <shape type="Tube" rmin="SDT_radius_min" rmax="SDT_radius_max" dz="SDT_half_length" />