diff --git a/Linear_cell_complex/examples/Linear_cell_complex/linear_cell_complex_3_operations.cpp b/Linear_cell_complex/examples/Linear_cell_complex/linear_cell_complex_3_operations.cpp
index 8a8524e9395..39bc3986745 100644
--- a/Linear_cell_complex/examples/Linear_cell_complex/linear_cell_complex_3_operations.cpp
+++ b/Linear_cell_complex/examples/Linear_cell_complex/linear_cell_complex_3_operations.cpp
@@ -4,7 +4,7 @@
 
 
 #ifdef CGAL_USE_BASIC_VIEWER
-#include "CGAL/Linear_cell_complex_viewer_qt.h"
+#include <CGAL/Linear_cell_complex_viewer_qt.h>
 #endif
 
 typedef CGAL::Linear_cell_complex_for_combinatorial_map<3> LCC_3_cmap;
diff --git a/Linear_cell_complex/examples/Linear_cell_complex/voronoi_2.cpp b/Linear_cell_complex/examples/Linear_cell_complex/voronoi_2.cpp
index 6a4ba8776bd..7833696d633 100644
--- a/Linear_cell_complex/examples/Linear_cell_complex/voronoi_2.cpp
+++ b/Linear_cell_complex/examples/Linear_cell_complex/voronoi_2.cpp
@@ -8,7 +8,7 @@
 
 
 #ifdef CGAL_USE_BASIC_VIEWER
-#include "CGAL/Linear_cell_complex_viewer_qt.h"
+#include <CGAL/Linear_cell_complex_viewer_qt.h>
 #endif
 
 // This example works both with cmap and gmap as combinatorial data structure.
diff --git a/Polyhedron/examples/Polyhedron/polyhedron_self_intersection.cpp b/Polyhedron/examples/Polyhedron/polyhedron_self_intersection.cpp
index 210a03adae1..e316fdfe69e 100644
--- a/Polyhedron/examples/Polyhedron/polyhedron_self_intersection.cpp
+++ b/Polyhedron/examples/Polyhedron/polyhedron_self_intersection.cpp
@@ -9,7 +9,7 @@
 #include <vector>
 
 #ifdef CGAL_USE_BASIC_VIEWER
-#include "polyhedron_viewer_qt.h"
+#include "CGAL/Polyhedron_viewer_qt.h"
 #endif
 
 using std::cerr;
diff --git a/Polyhedron/examples/Polyhedron/polyhedron_viewer_qt.h b/Polyhedron/include/CGAL/Polyhedron_viewer_qt.h
similarity index 100%
rename from Polyhedron/examples/Polyhedron/polyhedron_viewer_qt.h
rename to Polyhedron/include/CGAL/Polyhedron_viewer_qt.h