diff --git a/systemd.spec b/systemd.spec
index 31a46215..57b5b060 100644
--- a/systemd.spec
+++ b/systemd.spec
@@ -782,6 +782,7 @@ export CFLAGS="%{optflags} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
         -Doomd=%{when experimental} \
         -Drepart=%{when experimental} \
         -Dsysupdate=%{when experimental} \
+        -Dukify=%{when experimental} \
         \
         -Dtests=%{when testsuite unsafe} \
         -Dinstall-tests=%{when testsuite}