diff --git a/Mesh_3/include/CGAL/Mesh_3/Concurrent_mesher_config.h b/Mesh_3/include/CGAL/Mesh_3/Concurrent_mesher_config.h
index a13af2c571f..98810b5091c 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Concurrent_mesher_config.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Concurrent_mesher_config.h
@@ -32,6 +32,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <CGAL/use.h>
 
 // class Concurrent_mesher_config
 /// Singleton containing config
@@ -89,6 +90,7 @@ protected:
     const char *filename,
     bool reload_if_already_loaded = false)
   {
+    CGAL_USE(reload_if_already_loaded);
 #ifdef CGAL_USE_BOOST_PROGRAM_OPTIONS
     if (m_config_file_loaded && reload_if_already_loaded == false)
       return true;
diff --git a/Mesh_3/include/CGAL/Mesh_3/Mesher_level.h b/Mesh_3/include/CGAL/Mesh_3/Mesher_level.h
index 45b536c0d73..509be7abe19 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Mesher_level.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Mesher_level.h
@@ -101,7 +101,7 @@ struct Null_mesher_level {
   void add_to_TLS_lists(bool) {}
   void splice_local_lists() {}
   template <typename Mesh_visitor>
-  void before_next_element_refinement_in_superior(Mesh_visitor visitor) {}
+  void before_next_element_refinement_in_superior(Mesh_visitor) {}
   void before_next_element_refinement() {}
   //==============================================
 
diff --git a/Mesh_3/include/CGAL/Mesh_3/Sliver_perturber.h b/Mesh_3/include/CGAL/Mesh_3/Sliver_perturber.h
index 64fc2cfb275..b3a6c08bbf2 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Sliver_perturber.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Sliver_perturber.h
@@ -345,7 +345,7 @@ protected:
   template <typename Func, typename PVertex>
   void enqueue_work(Func, const PVertex &)          const {}
 
-  void increment_erase_counter(const Vertex_handle &vh) const {}
+  void increment_erase_counter(const Vertex_handle &) const {}
 };
 
 #ifdef CGAL_LINKED_WITH_TBB
diff --git a/Mesh_3/include/CGAL/Meshes/Filtered_deque_container.h b/Mesh_3/include/CGAL/Meshes/Filtered_deque_container.h
index e8314bdd4c8..2a368c4e494 100644
--- a/Mesh_3/include/CGAL/Meshes/Filtered_deque_container.h
+++ b/Mesh_3/include/CGAL/Meshes/Filtered_deque_container.h
@@ -47,7 +47,7 @@ namespace Meshes {
     typedef typename Container::size_type size_type;
     typedef typename Container::value_type value_type;
 
-    void add_to_TLS_lists_impl(bool add) {}
+    void add_to_TLS_lists_impl(bool) {}
     Element get_next_local_element_impl()
     { return Element(); }
     value_type get_next_local_raw_element_impl()
diff --git a/Mesh_3/include/CGAL/Meshes/Filtered_multimap_container.h b/Mesh_3/include/CGAL/Meshes/Filtered_multimap_container.h
index 00d1f584ab1..b6002aaf05f 100644
--- a/Mesh_3/include/CGAL/Meshes/Filtered_multimap_container.h
+++ b/Mesh_3/include/CGAL/Meshes/Filtered_multimap_container.h
@@ -46,7 +46,7 @@ namespace CGAL {
     typedef typename Map::size_type size_type;
     typedef typename Map::value_type value_type;
 
-    void add_to_TLS_lists_impl(bool add) {}
+    void add_to_TLS_lists_impl(bool) {}
     Element get_next_local_element_impl()
     { return Element(); }
     value_type get_next_local_raw_element_impl()