diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 01bfb1039..666f8f079 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -1,7 +1,7 @@
 INCLUDE (${CMAKE_ROOT}/Modules/FindFLTK.cmake)
 IF(FLTK_LIBRARY)
   IF(FLTK_INCLUDE_PATH)
-    OPTION(BUILD_FLTK_GUI "Build FLTK CMake GUI." "ON")
+    OPTION(BUILD_FLTK_GUI "Build FLTK CMake GUI." "OFF")
     IF(BUILD_FLTK_GUI)
       SUBDIRS(FLTKDialog)
     ENDIF(BUILD_FLTK_GUI)