diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 34006f3f4d..9e7a5d6c11 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,6 +4,8 @@ add_subdirectory( servicemenus )
 
 include_directories( ${CMAKE_SOURCE_DIR}/libkonq ${KDE4_INCLUDE_DIR} ${QT_INCLUDES}  )
 
+add_definitions (-DQT3_SUPPORT)
+
 ########### next target ###############
 
 set(dolphinprivate_LIB_SRCS