diff --git a/CMakeLists.txt b/CMakeLists.txt
index 439644bd9e..71e85068c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -511,7 +511,7 @@ endif(WIN32)
 # Extern
 add_subdirectory (extern/osg-ffmpeg-videoplayer)
 add_subdirectory (extern/oics)
-if (USE_QT)
+if (BUILD_OPENCS)
     add_subdirectory (extern/osgQt)
 endif()