diff --git a/Filtered_kernel/changes.txt b/Filtered_kernel/changes.txt
index fcd5be84f67..da68da7c97d 100644
--- a/Filtered_kernel/changes.txt
+++ b/Filtered_kernel/changes.txt
@@ -1,3 +1,7 @@
+18 July 2006 Menelaos Karavelas
+- removed Minmax_traits for Oriented_side and Comparison_result due to
+  clash with Sign (these three types are now the same).
+
 16 March 2006 Joachim Reichel
 - prefix cgal_ added to filtered_predicates_generator.pl
 
diff --git a/Filtered_kernel/include/CGAL/Uncertain.h b/Filtered_kernel/include/CGAL/Uncertain.h
index d857a3b9876..028c37e6e34 100644
--- a/Filtered_kernel/include/CGAL/Uncertain.h
+++ b/Filtered_kernel/include/CGAL/Uncertain.h
@@ -48,20 +48,6 @@ namespace CGALi {
     static const Sign max = POSITIVE;
   };
 
-  template <>
-  struct Minmax_traits <Comparison_result>
-  {
-    static const Comparison_result min = SMALLER;
-    static const Comparison_result max = LARGER;
-  };
-
-  template <>
-  struct Minmax_traits <Oriented_side>
-  {
-    static const Oriented_side min = ON_NEGATIVE_SIDE;
-    static const Oriented_side max = ON_POSITIVE_SIDE;
-  };
-
   template <>
   struct Minmax_traits <Bounded_side>
   {