diff --git a/package/libuci/libuci.mk b/package/libuci/libuci.mk
index 736b94689..a7d3a809d 100644
--- a/package/libuci/libuci.mk
+++ b/package/libuci/libuci.mk
@@ -10,10 +10,14 @@ LIBUCI_LICENSE = LGPLv2.1
 LIBUCI_INSTALL_STAGING = YES
 LIBUCI_DEPENDENCIES = libubox
 
-ifeq ($(BR2_PACKAGE_LUA),y)
-	LIBUCI_DEPENDENCIES += lua
+ifeq ($(BR2_USE_MMU),y) # fork()
+ifeq ($(BR2_PACKAGE_LUA_5_1),y)
+LIBUCI_DEPENDENCIES += lua
+LIBUCI_CONF_OPT += -DLUAPATH=$(STAGING_DIR)/usr/lib/lua/5.1 \
+	-DLUA_CFLAGS=-I$(STAGING_DIR)/usr/include
 else
-	LIBUCI_CONF_OPT += -DBUILD_LUA:BOOL=OFF
+LIBUCI_CONF_OPT += -DBUILD_LUA:BOOL=OFF
 endif
+endif # MMU
 
 $(eval $(cmake-package))