diff --git a/Combinatorial_map/include/CGAL/Combinatorial_map.h b/Combinatorial_map/include/CGAL/Combinatorial_map.h
index 44b8cdd5f9c..5f409521c1e 100644
--- a/Combinatorial_map/include/CGAL/Combinatorial_map.h
+++ b/Combinatorial_map/include/CGAL/Combinatorial_map.h
@@ -239,7 +239,7 @@ namespace CGAL {
                       bool copy_perforated_darts=false,
                       size_type mark_perforated=INVALID_MARK)
     {
-      this->clear();
+      // this->clear();
 
       /*this->mnb_used_marks = amap.mnb_used_marks;
       this->mmask_marks    = amap.mmask_marks;
diff --git a/Generalized_map/include/CGAL/Generalized_map.h b/Generalized_map/include/CGAL/Generalized_map.h
index 31623b6fbeb..73fa3becf5e 100644
--- a/Generalized_map/include/CGAL/Generalized_map.h
+++ b/Generalized_map/include/CGAL/Generalized_map.h
@@ -204,7 +204,7 @@ namespace CGAL {
                       bool copy_perforated_darts=false,
                       size_type mark_perforated=INVALID_MARK)
     {
-      this->clear();
+      //this->clear();
 
       /*this->mnb_used_marks = amap.mnb_used_marks;
       this->mmask_marks    = amap.mmask_marks;