diff --git a/Combinatorial_map/include/CGAL/Combinatorial_map_iterators_base.h b/Combinatorial_map/include/CGAL/Combinatorial_map_iterators_base.h
index 0b2c39bc720..dadf9165b56 100644
--- a/Combinatorial_map/include/CGAL/Combinatorial_map_iterators_base.h
+++ b/Combinatorial_map/include/CGAL/Combinatorial_map_iterators_base.h
@@ -163,7 +163,7 @@ namespace CGAL {
 
     /// test if adart->beta(ai)->beta(aj) exists and is not marked for amark
     bool is_unmarked2(Dart_descriptor adart, unsigned int ai, unsigned int aj,
-                      typename Map::size_type amark) const
+                      size_type amark) const
     { return
         !mmap->is_marked(mmap->beta(adart, ai, aj), amark);
     }
@@ -209,6 +209,8 @@ namespace CGAL {
     /// true iff this iterator is basic
     typedef Tag_true Basic_iterator;
 
+    typedef typename Map::size_type size_type;
+
   public:
     /// Main constructor.
     CMap_dart_iterator(Map& amap, Dart_descriptor adart):
@@ -263,7 +265,7 @@ namespace CGAL {
 
   protected:
     /// test if adart->beta(ai) exists and is not marked for amark
-    bool is_unmarked(Dart_descriptor adart, unsigned int ai, unsigned amark) const
+    bool is_unmarked(Dart_descriptor adart, unsigned int ai, size_type amark) const
     { return !mmap->is_marked(mmap->beta(adart,ai), amark); }
 
     /// test if adart->beta(ai)->beta(aj) exists
@@ -272,7 +274,7 @@ namespace CGAL {
 
     /// test if adart->beta(ai)->beta(aj) exists and is not marked for amark
     bool is_unmarked2(Dart_descriptor adart, unsigned int ai, unsigned int aj,
-                      unsigned amark) const
+                    size_type amark) const
     { return !mmap->is_marked(mmap->beta(adart, ai, aj), amark); }
 
   protected: