diff --git a/Makefile b/Makefile
index 35ecd4a1..fe3f9ec1 100644
--- a/Makefile
+++ b/Makefile
@@ -66,10 +66,13 @@ $(LUA_CLIB_PATH)/netpack.so : lualib-src/lua-netpack.c | $(LUA_CLIB_PATH)
 	$(CC) $(CFLAGS) $(SHARED) $^ -Iskynet-src -o $@ 
 
 $(LUA_CLIB_PATH)/cjson.so : | $(LUA_CLIB_PATH)
-	cd 3rd/lua-cjson && $(MAKE) LUA_INCLUDE_DIR=$(LUA_INC) CC=$(CC) CJSON_LDFLAGS="$(SHARED)" && cp cjson.so ../../$@
+	cd 3rd/lua-cjson && $(MAKE) LUA_INCLUDE_DIR=../../$(LUA_INC) CC=$(CC) CJSON_LDFLAGS="$(SHARED)" && cp cjson.so ../../$@
 
 $(LUA_CLIB_PATH)/clientsocket.so : lualib-src/lua-clientsocket.c | $(LUA_CLIB_PATH)
 	$(CC) $(CFLAGS) $(SHARED) $^ -o $@ -lpthread
 
 clean :
 	rm -f $(SKYNET_BUILD_PATH)/skynet $(CSERVICE_PATH)/*.so $(LUA_CLIB_PATH)/*.so
+
+cleanall: clean
+	cd 3rd/lua-cjson && $(MAKE) clean
diff --git a/platform.mk b/platform.mk
index 11031f89..20dba89c 100644
--- a/platform.mk
+++ b/platform.mk
@@ -3,7 +3,7 @@ PLATS = linux freebsd macosx
 
 CC ?= gcc
 
-.PHONY : none $(PLATS) clean all
+.PHONY : none $(PLATS) clean all cleanall
 
 ifneq ($(PLAT), none)