diff --git a/killer/CMakeLists.txt b/killer/CMakeLists.txt
index 111de928cd..3e7fc646ae 100644
--- a/killer/CMakeLists.txt
+++ b/killer/CMakeLists.txt
@@ -1,6 +1,3 @@
-
-
-
 ########### next target ###############
 
 set(kwin_killer_helper_SRCS killer.cpp )
@@ -8,6 +5,6 @@ set(kwin_killer_helper_SRCS killer.cpp )
 
 kde4_add_executable(kwin_killer_helper ${kwin_killer_helper_SRCS})
 
-target_link_libraries(kwin_killer_helper  ${KDE4_KDEUI_LIBS} )
+target_link_libraries(kwin_killer_helper ${KDE4_KDEUI_LIBS} ${X11_X11_LIB})
 
 install(TARGETS kwin_killer_helper ${INSTALL_TARGETS_DEFAULT_ARGS})