diff --git a/Core/examples/Core/delaunay.cpp b/Core/examples/Core/delaunay.cpp
index 05f5cb42e92..3de41f26bee 100644
--- a/Core/examples/Core/delaunay.cpp
+++ b/Core/examples/Core/delaunay.cpp
@@ -1,5 +1,3 @@
-#define CORE_NO_AUTOMATIC_NAMESPACE 1
-
 
 #include <CGAL/CORE_Expr.h>
 #include <CGAL/Simple_cartesian.h>
diff --git a/Core/include/CGAL/CORE/CORE.h b/Core/include/CGAL/CORE/CORE.h
index 072cf4e6333..05e3e7d9fd1 100644
--- a/Core/include/CGAL/CORE/CORE.h
+++ b/Core/include/CGAL/CORE/CORE.h
@@ -67,10 +67,6 @@ typedef long machine_long;
 #   include <CGAL/CORE/Expr.h>
 #endif
 
-#ifndef CORE_NO_AUTOMATIC_NAMESPACE
-using namespace CORE;
-#endif
-
 #endif // _CORE_CORE_H_