diff --git a/GraphicsView/include/CGAL/Qt/Basic_viewer_qt.h b/GraphicsView/include/CGAL/Qt/Basic_viewer_qt.h
index 944aa973fcf..c809ab05e8a 100644
--- a/GraphicsView/include/CGAL/Qt/Basic_viewer_qt.h
+++ b/GraphicsView/include/CGAL/Qt/Basic_viewer_qt.h
@@ -162,7 +162,11 @@ const char vertex_source_color_comp[] =
     "void main(void)\n"
     "{\n"
     "   fP = mv_matrix * vertex; \n"
-    "   fN = mat3(mv_matrix)* normal; \n"
+    "   mat3 mv_matrix_3; \n"
+    "   mv_matrix_3[0] = mv_matrix[0].xyz; \n"
+    "   mv_matrix_3[1] = mv_matrix[1].xyz; \n"
+    "   mv_matrix_3[2] = mv_matrix[2].xyz; \n"
+    "   fN = mv_matrix_3* normals;  \n"
     "   fColor = vec4(color, 1.0); \n"
     "   gl_PointSize = point_size;\n"
     "   gl_Position = mvp_matrix * vertex;\n"