diff --git a/Distance_3/include/CGAL/Distance_3/Segment_3_Segment_3.h b/Distance_3/include/CGAL/Distance_3/Segment_3_Segment_3.h
index 58b97d9c890..d9dcb2ef91b 100644
--- a/Distance_3/include/CGAL/Distance_3/Segment_3_Segment_3.h
+++ b/Distance_3/include/CGAL/Distance_3/Segment_3_Segment_3.h
@@ -198,7 +198,6 @@ compare_squared_distance(const typename K::Segment_3& s1,
   typedef typename K::FT                                                  FT;
   typedef typename K::Point_3                                             Point_3;
   typedef typename K::Vector_3                                            Vector_3;
-  typedef typename K::Line_3                                              Line_3;
 
   typename K::Construct_vertex_3 vertex = k.construct_vertex_3_object();
   typename K::Construct_vector_3 cv = k.construct_vector_3_object();
diff --git a/Distance_3/include/CGAL/Distance_3/Triangle_3_Triangle_3.h b/Distance_3/include/CGAL/Distance_3/Triangle_3_Triangle_3.h
index 6728b2bca61..9bf27fb6c2a 100644
--- a/Distance_3/include/CGAL/Distance_3/Triangle_3_Triangle_3.h
+++ b/Distance_3/include/CGAL/Distance_3/Triangle_3_Triangle_3.h
@@ -220,7 +220,6 @@ compare_squared_distance_disjoint(const typename K::Triangle_3& tr1,
                                   const K& k,
                                   const typename K::FT& d2)
 {
-  typedef typename K::FT                                                  FT;
   typedef typename K::Segment_3                                           Segment_3;
 
   typename K::Construct_vertex_3 vertex = k.construct_vertex_3_object();
diff --git a/Distance_3/include/CGAL/Distance_3/internal/squared_distance_utils_3.h b/Distance_3/include/CGAL/Distance_3/internal/squared_distance_utils_3.h
index 7aef6144006..7a1c5d94606 100644
--- a/Distance_3/include/CGAL/Distance_3/internal/squared_distance_utils_3.h
+++ b/Distance_3/include/CGAL/Distance_3/internal/squared_distance_utils_3.h
@@ -112,7 +112,7 @@ wdot(const typename K::Point_3 &p,
 }
 
 
-static double diff_of_products(const double a, const double b, const double c, const double d)
+static double diff_of_products(const double& a, const double& b, const double& c, const double& d)
 {
 // Kahan method, less numerical error
 #if 1
diff --git a/Distance_3/test/Distance_3/test_compare_distance_3.cpp b/Distance_3/test/Distance_3/test_compare_distance_3.cpp
index 79c995e7497..35fab5d58eb 100644
--- a/Distance_3/test/Distance_3/test_compare_distance_3.cpp
+++ b/Distance_3/test/Distance_3/test_compare_distance_3.cpp
@@ -764,8 +764,7 @@ int main()
 
   std::cout << "3D Distance tests" << std::endl;
 
-  CGAL::Random r(1740152576);
-  // CGAL::Random r;
+  CGAL::Random r;
   std::cout << "random seed = " << r.get_seed() << std::endl;
 
   // @todo Some tests are too difficult for these kernels
diff --git a/Intersections_3/include/CGAL/Intersections_3/internal/tetrahedron_lines_intersections_3.h b/Intersections_3/include/CGAL/Intersections_3/internal/tetrahedron_lines_intersections_3.h
index 4aba04c9e1a..9693b6ce436 100644
--- a/Intersections_3/include/CGAL/Intersections_3/internal/tetrahedron_lines_intersections_3.h
+++ b/Intersections_3/include/CGAL/Intersections_3/internal/tetrahedron_lines_intersections_3.h
@@ -19,6 +19,7 @@
 #include <CGAL/kernel_basic.h>
 #include <CGAL/Tetrahedron_3.h>
 #include <CGAL/Triangle_3.h>
+#include <CGAL/squared_distance_3.h>
 
 #include <utility>
 #include <vector>
diff --git a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/locate.h b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/locate.h
index 7e804e6d094..e21e0a4a0ed 100644
--- a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/locate.h
+++ b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/locate.h
@@ -28,6 +28,7 @@
 #include <CGAL/boost/graph/named_params_helper.h>
 #include <CGAL/Random.h>
 #include <CGAL/use.h>
+#include <CGAL/squared_distance_3.h>
 
 #include <boost/graph/graph_traits.hpp>
 #include <variant>