diff --git a/Detector/DetCRD/compact/CRD_o1_v01/CRD_o1_v01-onlyTracker.xml b/Detector/DetCRD/compact/CRD_o1_v01/CRD_o1_v01-onlyTracker.xml
index 9ede81b793e785ed44b1eb97b12b69af9ee48716..b35e32655575e8575a6eb1682017dbf55486d797 100644
--- a/Detector/DetCRD/compact/CRD_o1_v01/CRD_o1_v01-onlyTracker.xml
+++ b/Detector/DetCRD/compact/CRD_o1_v01/CRD_o1_v01-onlyTracker.xml
@@ -13,7 +13,6 @@
   
   <includes>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
-    <!--gdmlFile  ref="../CRD_common_v01/materials-woIsotope.xml"/-->
     <gdmlFile  ref="../CRD_common_v01/materials.xml"/>
   </includes>