diff --git a/Mesh_3/include/CGAL/Mesh_3/Dump_c3t3.h b/Mesh_3/include/CGAL/Mesh_3/Dump_c3t3.h
index 5a798e665e0..406e3d18cee 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Dump_c3t3.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Dump_c3t3.h
@@ -40,9 +40,10 @@ template <typename C3t3,
              Output_rep<typename C3t3::Subdomain_index>::is_specialized)
           >
 struct Dump_c3t3 {
-  void dump_c3t3(const C3t3& c3t3, std::string prefix) const
+  void dump_c3t3(const C3t3& c3t3, std::string prefix, bool verbose) const
   {
-    std::clog<<"======dump c3t3===== to: " << prefix << std::endl;
+    if (verbose)
+      std::clog<<"======dump c3t3===== to: " << prefix << std::endl;
     std::ofstream medit_file((prefix+".mesh").c_str());
     medit_file.precision(17);
     CGAL::IO::output_to_medit(medit_file, c3t3, false /*rebind*/, true /*show_patches*/);
@@ -63,7 +64,7 @@ struct Dump_c3t3 {
 template <typename C3t3>
 struct Dump_c3t3<C3t3, false>
 {
-  void dump_c3t3(const C3t3&, std::string) {
+  void dump_c3t3(const C3t3&, std::string, bool) {
     std::cerr << "Warning " << __FILE__ << ":" << __LINE__ << "\n"
               << "  the c3t3 object of following type:\n"
               << typeid(C3t3).name() << std::endl
@@ -123,11 +124,16 @@ void dump_c3t3_edges(const C3t3& c3t3, std::string prefix)
   }
 }
 template <typename C3t3>
-void dump_c3t3(const C3t3& c3t3, std::string prefix)
+void dump_c3t3(const C3t3& c3t3, std::string prefix,
+#ifdef CGAL_MESH_3_VERBOSE
+               bool verbose = true)
+#else
+               bool verbose = false)
+#endif
 {
   if(!prefix.empty()) {
     Dump_c3t3<C3t3> dump;
-    dump.dump_c3t3(c3t3, prefix);
+    dump.dump_c3t3(c3t3, prefix, verbose);
   }
 }
 
diff --git a/Tetrahedral_remeshing/include/CGAL/tetrahedral_remeshing.h b/Tetrahedral_remeshing/include/CGAL/tetrahedral_remeshing.h
index 90b6216f5f7..720217e0196 100644
--- a/Tetrahedral_remeshing/include/CGAL/tetrahedral_remeshing.h
+++ b/Tetrahedral_remeshing/include/CGAL/tetrahedral_remeshing.h
@@ -198,7 +198,7 @@ void tetrahedral_isotropic_remeshing(
   const SizingFunction& sizing,
   const NamedParameters& np)
 {
-  CGAL_assertion(tr.is_valid(true));
+  CGAL_assertion(tr.is_valid());
 
   typedef CGAL::Triangulation_3<Traits, TDS, SLDS> Tr;
 
@@ -395,7 +395,7 @@ void tetrahedral_isotropic_remeshing(
   const SizingFunction& sizing,
   const NamedParameters& np)
 {
-  CGAL_assertion(c3t3.triangulation().tds().is_valid(true));
+  CGAL_assertion(c3t3.triangulation().tds().is_valid());
 
   using parameters::get_parameter;
   using parameters::choose_parameter;