diff --git a/clients/nitrogen/CMakeLists.txt b/clients/nitrogen/CMakeLists.txt
index abf8185788..a8003921d2 100644
--- a/clients/nitrogen/CMakeLists.txt
+++ b/clients/nitrogen/CMakeLists.txt
@@ -1,5 +1,3 @@
-add_definitions (-DQT3_SUPPORT -DQT3_SUPPORT_WARNINGS)
-
 ########### add version number into compilation defines
 add_definitions ( -DAPP_VERSION=\\\"${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}\\\")
 add_subdirectory( config ) 
diff --git a/clients/nitrogen/config/CMakeLists.txt b/clients/nitrogen/config/CMakeLists.txt
index 6dd244f49d..e14c23ba7c 100644
--- a/clients/nitrogen/config/CMakeLists.txt
+++ b/clients/nitrogen/config/CMakeLists.txt
@@ -1,8 +1,5 @@
 include_directories( ${KDEBASE_WORKSPACE_SOURCE_DIR}/kwin/lib  )
 
-add_definitions (-DQT3_SUPPORT -DQT3_SUPPORT_WARNINGS)
-
-########### next target ###############
 
 set(kwin_nitrogen_config_PART_SRCS 
     config.cpp