diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,7 +47,7 @@
 find_package(KF5TextEditor)
 find_package(KWinDBusInterface CONFIG REQUIRED)
 
-find_package(KScreenLocker REQUIRED)
+find_package(KScreenLocker 5.13.80 REQUIRED)
 find_package(ScreenSaverDBusInterface CONFIG REQUIRED)
 find_package(KF5Holidays)
 set_package_properties(KF5Holidays PROPERTIES DESCRIPTION "Holidays provider for Plasma calendar"
diff --git a/ksmserver/CMakeLists.txt b/ksmserver/CMakeLists.txt
--- a/ksmserver/CMakeLists.txt
+++ b/ksmserver/CMakeLists.txt
@@ -44,7 +44,7 @@
 set(klauncher_xml ${KINIT_DBUS_INTERFACES_DIR}/kf5_org.kde.KLauncher.xml)
 qt5_add_dbus_interface( ksmserver_KDEINIT_SRCS ${klauncher_xml} klauncher_interface )
 
-qt5_add_dbus_interface( ksmserver_KDEINIT_SRCS ${KDE_INSTALL_FULL_DBUSINTERFACEDIR}/org.kde.screensaver.xml kscreenlocker_interface )
+qt5_add_dbus_interface( ksmserver_KDEINIT_SRCS ${KSCREENLOCKER_DBUS_INTERFACES_DIR}/org.kde.screensaver.xml kscreenlocker_interface )
 
 
 qt5_add_dbus_adaptor( ksmserver_KDEINIT_SRCS org.kde.KSMServerInterface.xml server.h KSMServer )