diff --git a/kde-modules/KDEInstallDirs.cmake b/kde-modules/KDEInstallDirs.cmake
--- a/kde-modules/KDEInstallDirs.cmake
+++ b/kde-modules/KDEInstallDirs.cmake
@@ -132,6 +132,12 @@
 #     Qt logging categories files directory (``DATAROOTDIR/qlogging-categories5``) Since 5.59.0
 # ``JARDIR``
 #     Java AAR/JAR files for Android. Since 5.62.0
+# ``SYSTEMDUNITDIR``
+#     Systemd Units (``LIBDIR/systemd``)
+#     [``SYSTEMD_UNIT_INSTALL_DIR``]. Since 5.FIXME
+# ``SYSTEMDUSERUNITDIR``
+#     Systemd uSER Units (``LIBDIR/systemd/user``)
+#     [``SYSTEMD_USER_UNIT_INSTALL_DIR``]. Since 5.FIXME
 #
 # If ``KDE_INSTALL_USE_QT_SYS_PATHS`` is set to TRUE before including this
 # module, the default values for some variables are instead queried from
@@ -640,8 +646,12 @@
 _define_relative(DBUSSYSTEMSERVICEDIR DBUSDIR "system-services"
     "D-Bus system services"
     DBUS_SYSTEM_SERVICES_INSTALL_DIR)
-
-
+_define_relative(SYSTEMDUNITDIR LIBDIR "systemd"
+    "Systemd units"
+    SYSTEMD_UNIT_INSTALL_DIR)
+_define_relative(SYSTEMDUSERUNITDIR SYSTEMDUNITDIR "user"
+    "Systemd user units"
+    SYSTEMD_USER_UNIT_INSTALL_DIR)
 
 
 set(_default_sysconf_dir "etc")
diff --git a/tests/KDEInstallDirsTest/var_list.cmake b/tests/KDEInstallDirsTest/var_list.cmake
--- a/tests/KDEInstallDirsTest/var_list.cmake
+++ b/tests/KDEInstallDirsTest/var_list.cmake
@@ -42,6 +42,8 @@
     SHAREDSTATEDIR
     SOUNDDIR
     SYSCONFDIR
+    SYSTEMDUNITDIR
+    SYSTEMDUSERUNITDIR
     TEMPLATEDIR
     WALLPAPERDIR)
 if(APPLE)
@@ -84,6 +86,8 @@
 set(compat_SBINDIR SBIN_INSTALL_DIR)
 set(compat_SOUNDDIR SOUND_INSTALL_DIR)
 set(compat_SYSCONFDIR SYSCONF_INSTALL_DIR)
+set(compat_SYSTEM_UNIT_INSTALL_DIR)
+set(compat_SYSTEM_USER_UNIT_INSTALL_DIR)
 set(compat_TEMPLATEDIR TEMPLATES_INSTALL_DIR)
 set(compat_WALLPAPERDIR WALLPAPER_INSTALL_DIR)
 if(APPLE)