diff --git a/Detector/MagneticFieldMap/src/GenericBFieldMapBrBz.cpp b/Detector/MagneticFieldMap/src/GenericBFieldMapBrBz.cpp
index b4125d41f41712848236fc2abc7c86d6dcaff475..f69a94c2e49bcd5fb45461ee37479ac2afa98e4b 100644
--- a/Detector/MagneticFieldMap/src/GenericBFieldMapBrBz.cpp
+++ b/Detector/MagneticFieldMap/src/GenericBFieldMapBrBz.cpp
@@ -3,6 +3,7 @@
 
 GenericBFieldMapBrBz::GenericBFieldMapBrBz()
     : m_provider(nullptr) {
+    type = dd4hep::CartesianField::MAGNETIC;
 
 }