diff --git a/kcmkwin/kwinrules/CMakeLists.txt b/kcmkwin/kwinrules/CMakeLists.txt
index 883eda0f2a..4b9c3e6893 100644
--- a/kcmkwin/kwinrules/CMakeLists.txt
+++ b/kcmkwin/kwinrules/CMakeLists.txt
@@ -1,4 +1,8 @@
-include_directories( ${CMAKE_SOURCE_DIR}/workspace/kwin/lib  ${CMAKE_SOURCE_DIR}/workspace/kwin/lib  )
+include_directories(
+    ${CMAKE_SOURCE_DIR}/workspace/kwin/lib
+    ${CMAKE_SOURCE_DIR}/workspace/kwin/lib
+    ${CMAKE_BINARY_DIR}/workspace/kwin
+)
 
 ADD_DEFINITIONS(-DKCMRULES)
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