diff --git a/STL_Extension/test/STL_Extension/test_stl_extension.cpp b/STL_Extension/test/STL_Extension/test_stl_extension.cpp
index d106dbca477..9f5a096b414 100644
--- a/STL_Extension/test/STL_Extension/test_stl_extension.cpp
+++ b/STL_Extension/test/STL_Extension/test_stl_extension.cpp
@@ -2890,7 +2890,7 @@ void test_Iterator_project()
     CGAL::Assert_iterator( c_end);
 
     while(! l.empty()){
-      delete l.back();
+      delete static_cast<item*>(l.back());
       l.pop_back();
     }