diff --git a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/CMakeLists.txt b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/CMakeLists.txt
index b3ee7bf600a..732557c7c99 100644
--- a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/CMakeLists.txt
+++ b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/CMakeLists.txt
@@ -20,7 +20,6 @@ include( ${CGAL_USE_FILE} )
 set ( QT_USE_QTXML    TRUE )
 set ( QT_USE_QTMAIN   TRUE )
 set ( QT_USE_QTOPENGL TRUE )
-set ( QT_USE_QTASSISTANT TRUE )
 find_package(Qt4)
 
 # Find OpenGL
diff --git a/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/CMakeLists.txt b/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/CMakeLists.txt
index 7b424b684fd..9bf4977d29e 100644
--- a/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/CMakeLists.txt
+++ b/Periodic_3_triangulation_3/demo/Periodic_Lloyd_3/CMakeLists.txt
@@ -19,7 +19,6 @@ set( QT_USE_QTXML    TRUE )
 set( QT_USE_QTMAIN   TRUE )
 set( QT_USE_QTSCRIPT  TRUE )
 set( QT_USE_QTOPENGL  TRUE )
-set( QT_USE_QTASSISTANT TRUE )
 find_package(Qt4)
 
 find_package(OpenGL)
diff --git a/Triangulation_3/demo/Triangulation_3/CMakeLists.txt b/Triangulation_3/demo/Triangulation_3/CMakeLists.txt
index 493fe900784..12ec8cf138f 100644
--- a/Triangulation_3/demo/Triangulation_3/CMakeLists.txt
+++ b/Triangulation_3/demo/Triangulation_3/CMakeLists.txt
@@ -19,7 +19,6 @@ set( QT_USE_QTXML    TRUE )
 set( QT_USE_QTMAIN   TRUE )
 set( QT_USE_QTSCRIPT  TRUE )
 set( QT_USE_QTOPENGL  TRUE )
-set( QT_USE_QTASSISTANT TRUE )
 find_package(Qt4)
 
 find_package(OpenGL)