diff --git a/Straight_skeleton_2/include/CGAL/create_weighted_offset_polygons_2.h b/Straight_skeleton_2/include/CGAL/create_weighted_offset_polygons_2.h
index bfc112a5e5f..96783aaa244 100644
--- a/Straight_skeleton_2/include/CGAL/create_weighted_offset_polygons_2.h
+++ b/Straight_skeleton_2/include/CGAL/create_weighted_offset_polygons_2.h
@@ -127,7 +127,7 @@ create_partial_exterior_weighted_straight_skeleton_2(const FT& aMaxOffset,
   typedef typename Kernel_traits<Point_2>::Kernel                    IK;
   typedef typename IK::FT                                            IFT;
 
-  static_assert(std::is_same_v<typename std::iterator_traits<WeightIterator>::value_type, IFT>);
+  static_assert((std::is_same<typename std::iterator_traits<WeightIterator>::value_type, IFT>::value));
 
   boost::shared_ptr<Straight_skeleton_2<K> > rSkeleton;
 
diff --git a/Straight_skeleton_2/include/CGAL/create_weighted_straight_skeleton_2.h b/Straight_skeleton_2/include/CGAL/create_weighted_straight_skeleton_2.h
index b4eec6b8c21..5dfe7354467 100644
--- a/Straight_skeleton_2/include/CGAL/create_weighted_straight_skeleton_2.h
+++ b/Straight_skeleton_2/include/CGAL/create_weighted_straight_skeleton_2.h
@@ -27,6 +27,7 @@
 
 #include <algorithm>
 #include <iterator>
+#include <type_traits>
 #include <vector>
 
 namespace CGAL {
@@ -147,7 +148,7 @@ create_exterior_weighted_straight_skeleton_2(const FT& max_offset,
   using IK = typename Kernel_traits<Point_2>::Kernel;
   using IFT = typename IK::FT;
 
-  static_assert(std::is_same_v<typename std::iterator_traits<WeightIterator>::value_type, IFT>);
+  static_assert((std::is_same<typename std::iterator_traits<WeightIterator>::value_type, IFT>::value));
 
   boost::shared_ptr<Straight_skeleton_2<K> > skeleton;