diff --git a/Detector/DetDriftChamber/compact/det.xml b/Detector/DetDriftChamber/compact/det.xml
index 74921522d67a6cfa54f3a4f6a01fdff40c39fc5e..ece9ae233e235378d7758b0e7e4bddefb09630b1 100644
--- a/Detector/DetDriftChamber/compact/det.xml
+++ b/Detector/DetDriftChamber/compact/det.xml
@@ -63,7 +63,7 @@
     <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>
 
diff --git a/Detector/DetDriftChamber/src/driftchamber/DriftChamber.cpp b/Detector/DetDriftChamber/src/driftchamber/DriftChamber.cpp
index 0d29758873c45fb8b7b1a2d339fb289a95f48c94..7842b4745a0b89b33a59d58ce44830ccbd88040d 100644
--- a/Detector/DetDriftChamber/src/driftchamber/DriftChamber.cpp
+++ b/Detector/DetDriftChamber/src/driftchamber/DriftChamber.cpp
@@ -67,7 +67,7 @@ static dd4hep::Ref_t create_detector(dd4hep::Detector& theDetector,
     int outer_chamber_enabled = theDetector.constant<int>("DC_outer_chamber_enabled");
 
     // - safe distance
-    double safe_diatance = theDetector.constant<double>("Safe_distance");
+    double safe_diatance = theDetector.constant<double>("DC_safe_distance");
 
     // =======================================================================
     // Detector Construction