diff --git a/LEGO1/lego/sources/3dmanager/lego3dmanager.h b/LEGO1/lego/sources/3dmanager/lego3dmanager.h
index 8445800b..d54fe45b 100644
--- a/LEGO1/lego/sources/3dmanager/lego3dmanager.h
+++ b/LEGO1/lego/sources/3dmanager/lego3dmanager.h
@@ -4,8 +4,10 @@
 #include "assert.h"
 #include "lego3dview.h"
 
-class Tgl::Renderer;
-class Tgl::Group;
+namespace Tgl {
+class Renderer;
+class Group;
+}
 class ViewROI;
 
 // ??? for now
diff --git a/LEGO1/lego/sources/3dmanager/legoview1.h b/LEGO1/lego/sources/3dmanager/legoview1.h
index 20ccadfa..f98cfa23 100644
--- a/LEGO1/lego/sources/3dmanager/legoview1.h
+++ b/LEGO1/lego/sources/3dmanager/legoview1.h
@@ -4,7 +4,9 @@
 #include "compat.h"
 #include "tglsurface.h"
 
-class Tgl::Camera;
+namespace tgl {
+class Camera;
+}
 
 /////////////////////////////////////////////////////////////////////////////
 // LegoView
diff --git a/LEGO1/lego/sources/3dmanager/tglsurface.h b/LEGO1/lego/sources/3dmanager/tglsurface.h
index 2ea4cf12..67ca8903 100644
--- a/LEGO1/lego/sources/3dmanager/tglsurface.h
+++ b/LEGO1/lego/sources/3dmanager/tglsurface.h
@@ -4,10 +4,12 @@
 #include "mxdirectx/mxstopwatch.h"
 #include "tgl/tgl.h"
 
-class Tgl::Renderer;
-class Tgl::Device;
-class Tgl::View;
-class Tgl::Group;
+namespace Tgl {
+class Renderer;
+class Device;
+class View;
+class Group;
+}
 
 /////////////////////////////////////////////////////////////////////////////
 // TglSurface