diff --git a/Linear_cell_complex/include/CGAL/draw_linear_cell_complex.h b/Linear_cell_complex/include/CGAL/draw_linear_cell_complex.h
index 304dcced527..a6ae00b9e69 100644
--- a/Linear_cell_complex/include/CGAL/draw_linear_cell_complex.h
+++ b/Linear_cell_complex/include/CGAL/draw_linear_cell_complex.h
@@ -25,6 +25,7 @@
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/Random.h>
+#include <iostream>
 
 namespace CGAL
 {
diff --git a/Polyhedron/include/CGAL/draw_polyhedron.h b/Polyhedron/include/CGAL/draw_polyhedron.h
index 870c645296f..f2a1d9f7dff 100644
--- a/Polyhedron/include/CGAL/draw_polyhedron.h
+++ b/Polyhedron/include/CGAL/draw_polyhedron.h
@@ -27,6 +27,7 @@
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/Random.h>
+#include <iostream>
 
 namespace CGAL
 {
diff --git a/Surface_mesh/include/CGAL/draw_surface_mesh.h b/Surface_mesh/include/CGAL/draw_surface_mesh.h
index df6f6f23a49..2f5c93dc249 100644
--- a/Surface_mesh/include/CGAL/draw_surface_mesh.h
+++ b/Surface_mesh/include/CGAL/draw_surface_mesh.h
@@ -42,6 +42,7 @@ void draw(const SM& asm);
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/Random.h>
+#include <iostream>
 
 namespace CGAL
 {
diff --git a/Triangulation_2/include/CGAL/draw_triangulation_2.h b/Triangulation_2/include/CGAL/draw_triangulation_2.h
index 31568da6352..9b480398545 100644
--- a/Triangulation_2/include/CGAL/draw_triangulation_2.h
+++ b/Triangulation_2/include/CGAL/draw_triangulation_2.h
@@ -27,6 +27,7 @@
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/Random.h>
+#include <iostream>
 
 namespace CGAL
 {
diff --git a/Triangulation_3/include/CGAL/draw_triangulation_3.h b/Triangulation_3/include/CGAL/draw_triangulation_3.h
index e64ff5d5e97..f18cf1390ba 100644
--- a/Triangulation_3/include/CGAL/draw_triangulation_3.h
+++ b/Triangulation_3/include/CGAL/draw_triangulation_3.h
@@ -27,6 +27,7 @@
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/Random.h>
+#include <iostream>
 
 namespace CGAL
 {