diff --git a/DDRec/src/convertToGear.cc b/DDRec/src/convertToGear.cc
index 4aca79b7f127f9b71bef1f60ee750cb785da98aa..fd7e6e7b1367599947f8c9ce3d0847db9fdd1ffd 100644
--- a/DDRec/src/convertToGear.cc
+++ b/DDRec/src/convertToGear.cc
@@ -20,7 +20,7 @@
 using namespace std ;
 using namespace DD4hep ;
 using namespace DD4hep::Geometry;
-using namespace tgeo ;
+using namespace dd4hep ;
 
 //=============================================================================
 
diff --git a/DDTest/src/test_surface.cc b/DDTest/src/test_surface.cc
index f3c3499d8de06fe9cd62db249451302cc6b80e5f..f7ff9209359b16e4c3f20692d7b6851a64255ea3 100644
--- a/DDTest/src/test_surface.cc
+++ b/DDTest/src/test_surface.cc
@@ -20,7 +20,6 @@ using namespace Geometry;
 using namespace DDRec ;
 using namespace DDSurfaces ;
 
-//using namespace tgeo ;
 
 // this should be the first line in your test
 DDTest test = DDTest( "surface" ) ; 
diff --git a/examples/ILDExSimu/src/test_surfaces.cc b/examples/ILDExSimu/src/test_surfaces.cc
index feec7f9987b410d4ff26bb7e685bf1c6510ca4b6..599b4d85811f41402abaf4fca866f404899000e2 100644
--- a/examples/ILDExSimu/src/test_surfaces.cc
+++ b/examples/ILDExSimu/src/test_surfaces.cc
@@ -25,7 +25,6 @@ using namespace DDSurfaces ;
 using namespace lcio;
 
 
-//using namespace tgeo ;
 DDTest test = DDTest( "surfaces" ) ; 
 
 //=============================================================================