diff --git a/qatsh/CMakeLists.txt b/qatsh/CMakeLists.txt
index 627be0f..ab4ce15 100644
--- a/qatsh/CMakeLists.txt
+++ b/qatsh/CMakeLists.txt
@@ -8,7 +8,7 @@ message(STATUS "Configuring qatsh ...")
 # External dependencies.
 # 1) Qt (4 or 5)
 if(NOT DEFINED OPTION_QT5 OR NOT OPTION_QT5)
-  SET(OPTION_QT5 Off CACHE BOOL "Check to build with Qt 5 (rather than Qt 4)" FORCE)
+  SET(OPTION_QT5 ON CACHE BOOL "Check to build with Qt 5 (rather than Qt 4)" FORCE)
 endif()
 if(NOT OPTION_QT5)
   find_package(Qt4 4.4 COMPONENTS QtCore QtGui REQUIRED)