diff --git a/Skin_surface_3/test/Skin_surface_3/degenerate_test.C b/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
index 8871a56c863..43c13b27952 100644
--- a/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
+++ b/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
@@ -6,6 +6,7 @@
 
 #include <list>
 #include <fstream>
+#include <algorithm>
 
 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
 typedef CGAL::Regular_triangulation_euclidean_traits_3<K>   Traits;