diff --git a/Convex_hull_2/demo/Convex_hull_2/convex_hull_2.C b/Convex_hull_2/demo/Convex_hull_2/convex_hull_2.C
index 5df53d556a1..cc5e8e48eb0 100644
--- a/Convex_hull_2/demo/Convex_hull_2/convex_hull_2.C
+++ b/Convex_hull_2/demo/Convex_hull_2/convex_hull_2.C
@@ -17,6 +17,7 @@
 //
 // Author(s)     : Radu Ursu
 
+#include <CGAL/basic.h>
 
 // if QT is not installed, a message will be issued in runtime.
 #ifndef CGAL_USE_QT
@@ -39,7 +40,6 @@ int main(int, char*)
 #include <set>
 #include <string>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/convex_hull_2.h>
 #include <CGAL/Polygon_2_algorithms.h>