diff --git a/Curved_kernel/demo/Curved_kernel/demo.C b/Curved_kernel/demo/Curved_kernel/demo.C
index 2e19c886355..0e5561d118c 100644
--- a/Curved_kernel/demo/Curved_kernel/demo.C
+++ b/Curved_kernel/demo/Curved_kernel/demo.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -28,7 +30,6 @@ int main() {
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>
 
diff --git a/Curved_kernel/demo/Curved_kernel/demo_Lazy_line_circle.C b/Curved_kernel/demo/Curved_kernel/demo_Lazy_line_circle.C
index 13c7287517e..a69e39f6746 100644
--- a/Curved_kernel/demo/Curved_kernel/demo_Lazy_line_circle.C
+++ b/Curved_kernel/demo/Curved_kernel/demo_Lazy_line_circle.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -53,7 +55,6 @@ struct Binary_operator_result <Root_of_2<T1>, Root_of_2<T2> >;
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>
 
diff --git a/Curved_kernel/demo/Curved_kernel/demo_elias.C b/Curved_kernel/demo/Curved_kernel/demo_elias.C
index 2669df57bd6..1a4a2935f86 100644
--- a/Curved_kernel/demo/Curved_kernel/demo_elias.C
+++ b/Curved_kernel/demo/Curved_kernel/demo_elias.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -28,7 +30,6 @@ int main() {
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>
 
diff --git a/Curved_kernel/demo/Curved_kernel/demo_line.C b/Curved_kernel/demo/Curved_kernel/demo_line.C
index 05c1d7daf09..ffd660b34ec 100644
--- a/Curved_kernel/demo/Curved_kernel/demo_line.C
+++ b/Curved_kernel/demo/Curved_kernel/demo_line.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -28,7 +30,6 @@ int main() {
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>
 
diff --git a/Curved_kernel/demo/Curved_kernel/demo_line_circle.C b/Curved_kernel/demo/Curved_kernel/demo_line_circle.C
index 3b7f38c60a9..c4969cce02b 100644
--- a/Curved_kernel/demo/Curved_kernel/demo_line_circle.C
+++ b/Curved_kernel/demo/Curved_kernel/demo_line_circle.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -28,7 +30,6 @@ int main() {
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>
 
diff --git a/Curved_kernel/demo/Curved_kernel/demo_viewer.C b/Curved_kernel/demo/Curved_kernel/demo_viewer.C
index 16ffd24eca3..42b2e0b93db 100644
--- a/Curved_kernel/demo/Curved_kernel/demo_viewer.C
+++ b/Curved_kernel/demo/Curved_kernel/demo_viewer.C
@@ -17,6 +17,8 @@
 // - Move more basic IO routines in include/CGAL/IO/
 // - File menu
 
+#include <CGAL/basic.h>
+
 // if QT is not installed, a message will be issued at runtime.
 #ifndef CGAL_USE_QT
 #include <iostream>
@@ -28,7 +30,6 @@ int main() {
 
 #include <fstream>
 
-#include <CGAL/basic.h>
 #include <CGAL/Cartesian.h>
 #include <CGAL/point_generators_2.h>