diff --git a/DDSurfaces/include/DDSurfaces/ISurface.h b/DDSurfaces/include/DDSurfaces/ISurface.h
index c075f4649be1fc4164e04fed5f0e3ba006ce120b..729170ba969670290ea34bf6914cf2f972799a4e 100644
--- a/DDSurfaces/include/DDSurfaces/ISurface.h
+++ b/DDSurfaces/include/DDSurfaces/ISurface.h
@@ -111,7 +111,7 @@ namespace DDSurfaces {
   
   public:
     /// enum for defining the bits used to decode the properties
-    enum{
+    enum SurfaceTypes {
       Cylinder = 0,
       Plane,
       Sensitive,