diff --git a/kcmkwin/CMakeLists.txt b/kcmkwin/CMakeLists.txt
index 0a335a3991..e3f4d58217 100644
--- a/kcmkwin/CMakeLists.txt
+++ b/kcmkwin/CMakeLists.txt
@@ -2,7 +2,7 @@ remove_definitions(-DQT_NO_CAST_FROM_ASCII -DQT_STRICT_ITERATORS -DQT_NO_CAST_FR
 
 add_subdirectory( kwinoptions )
 # add_subdirectory( kwindecoration )
-# add_subdirectory( kwinrules )
+add_subdirectory( kwinrules )
 # add_subdirectory( kwincompositing )
 if(KWIN_BUILD_SCREENEDGES)
     add_subdirectory( kwinscreenedges )