diff --git a/kcmkwin/CMakeLists.txt b/kcmkwin/CMakeLists.txt
index 1ea1df384c..5fb0eb994c 100644
--- a/kcmkwin/CMakeLists.txt
+++ b/kcmkwin/CMakeLists.txt
@@ -12,6 +12,6 @@ if(KWIN_BUILD_SCRIPTING)
 endif()
 add_subdirectory( kwindesktop )
 
-# if( KWIN_BUILD_TABBOX )
-# add_subdirectory( kwintabbox )
-# endif()
+if( KWIN_BUILD_TABBOX )
+add_subdirectory( kwintabbox )
+endif()