diff --git a/GraphicsView/demo/Polygon/CMakeLists.txt b/GraphicsView/demo/Polygon/CMakeLists.txt
index 9876fae6de3..3ba4a46f611 100644
--- a/GraphicsView/demo/Polygon/CMakeLists.txt
+++ b/GraphicsView/demo/Polygon/CMakeLists.txt
@@ -41,7 +41,7 @@ if ( CGAL_FOUND AND CGAL_Qt4_FOUND AND QT4_FOUND )
   qt4_add_resources ( DT_RESOURCE_FILES ./Polygon_2.qrc )
 
   # use the Qt MOC preprocessor on classes that derives from QObject
-  qt4_generate_moc( Polygon_2.cpp ${CMAKE_BINARY_DIR}/Polygon_2.moc )
+  qt4_generate_moc( Polygon_2.cpp "${CMAKE_CURRENT_BINARY_DIR}/Polygon_2.moc" )
 
   # The executable itself.
   add_executable  ( Polygon_2 Polygon_2.cpp Polygon_2.moc ${DT_UI_FILES} ${DT_RESOURCE_FILES} )