diff --git a/Packages/Interval_skip_list/include/CGAL/Interval_skip_list.h b/Packages/Interval_skip_list/include/CGAL/Interval_skip_list.h
index 4b874b52c4e..bda85271e41 100644
--- a/Packages/Interval_skip_list/include/CGAL/Interval_skip_list.h
+++ b/Packages/Interval_skip_list/include/CGAL/Interval_skip_list.h
@@ -29,11 +29,12 @@
 #include <cassert>
 #include <iostream>
 #include <CGAL/Random.h>
-//#define CCC
+#define CCC
 //#define ISL_LIST
 
+#if defined(CCC) || ! defined(ISL_LIST)
 #include <CGAL/Compact_container.h>
-
+#endif
 
 namespace CGAL {