diff --git a/package/libubox/libubox.mk b/package/libubox/libubox.mk
index b552227ea5..74db0ccd80 100644
--- a/package/libubox/libubox.mk
+++ b/package/libubox/libubox.mk
@@ -10,14 +10,12 @@ LIBUBOX_LICENSE = LGPLv2.1, GPLv2, BSD-3c, MIT
 LIBUBOX_INSTALL_STAGING = YES
 LIBUBOX_DEPENDENCIES = host-pkgconf $(if $(BR2_PACKAGE_JSON_C),json-c)
 
-ifeq ($(BR2_USE_MMU),y) # fork()
-ifeq ($(BR2_PACKAGE_LUA_5_1),y)
+ifeq ($(BR2_USE_MMU)$(BR2_PACKAGE_LUA_5_1),yy)
 LIBUBOX_DEPENDENCIES += lua
 LIBUBOX_CONF_OPT += -DLUAPATH=$(STAGING_DIR)/usr/lib/lua/5.1 \
 	-DLUA_CFLAGS=-I$(STAGING_DIR)/usr/include
 else
 LIBUBOX_CONF_OPT += -DBUILD_LUA:BOOL=OFF
 endif
-endif # MMU
 
 $(eval $(cmake-package))