diff --git a/Snap_rounding_2/demo/Snap_rounding_2/snap_rounding_2.C b/Snap_rounding_2/demo/Snap_rounding_2/snap_rounding_2.C
index 44d44be009d..cce492235f4 100644
--- a/Snap_rounding_2/demo/Snap_rounding_2/snap_rounding_2.C
+++ b/Snap_rounding_2/demo/Snap_rounding_2/snap_rounding_2.C
@@ -19,6 +19,7 @@
 
 #include <iostream>
 #include <cstdlib>
+#include <CGAL/basic.h>
 
 #ifndef CGAL_USE_QT
 int main(int, char*)