diff --git a/CMakeLists.txt b/CMakeLists.txt
index 15d2ac4d6..c2a021258 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -78,6 +78,7 @@ OPTION( WITH_AVAHI "Enable AVAHI support" OFF )
 OPTION( WITH_PCRE "Enable pcre regex support for kjs" ON )
 OPTION( WITH_INOTIFY "Enable inotify support for kio" ON )
 OPTION( WITH_GAMIN "Enable FAM/GAMIN support" ${WITH_ALL_OPTIONS} )
+OPTION( WITH_SUDO_KDESU_BACKEND "Use sudo as backend for kdesu (default is su)" OFF )
 
 OPTION( WITH_ASPELL "Enable aspell support" OFF )
 OPTION( WITH_HSPELL "Enable hspell support" OFF )