diff --git a/Kernel_d/include/CGAL/Kernel_d/Direction_d.h b/Kernel_d/include/CGAL/Kernel_d/Direction_d.h
index 4cef344f845..70bd4c1b725 100644
--- a/Kernel_d/include/CGAL/Kernel_d/Direction_d.h
+++ b/Kernel_d/include/CGAL/Kernel_d/Direction_d.h
@@ -62,6 +62,10 @@ class Direction_d : public pR::Direction_d_base
   { return Base::operator==(w); }
   bool operator!=(const Self& w) const
   { return Base::operator!=(w); }
+  bool operator==(const Base& w) const
+  { return Base::operator==(w); }
+  bool operator!=(const Base& w) const
+  { return Base::operator!=(w); }
 };
 
 } //namespace CGAL
diff --git a/Kernel_d/include/CGAL/Kernel_d/Vector_d.h b/Kernel_d/include/CGAL/Kernel_d/Vector_d.h
index f434e579f6b..ffd79e265ba 100644
--- a/Kernel_d/include/CGAL/Kernel_d/Vector_d.h
+++ b/Kernel_d/include/CGAL/Kernel_d/Vector_d.h
@@ -91,6 +91,10 @@ class Vector_d : public pR::Vector_d_base
   { return Base::operator==(w); }
   bool operator!=(const Self& w) const
   { return Base::operator!=(w); }
+  bool operator==(const Base& w) const
+  { return Base::operator==(w); }
+  bool operator!=(const Base& w) const
+  { return Base::operator!=(w); }
 
 };