diff --git a/package/systemd/systemd.mk b/package/systemd/systemd.mk
index b56c6c6b26..f58e037943 100644
--- a/package/systemd/systemd.mk
+++ b/package/systemd/systemd.mk
@@ -319,7 +319,7 @@ endif
 
 SYSTEMD_FALLBACK_HOSTNAME = $(call qstrip,$(BR2_TARGET_GENERIC_HOSTNAME))
 ifneq ($(SYSTEMD_FALLBACK_HOSTNAME),)
-SYSTEMD_CONF_OPTS += --with-fallback-hostname=$(SYSTEMD_FALLBACK_HOSTNAME)
+SYSTEMD_CONF_OPTS += -Dfallback-hostname=$(SYSTEMD_FALLBACK_HOSTNAME)
 endif
 
 define SYSTEMD_INSTALL_INIT_HOOK