diff --git a/Makefile b/Makefile
index 2b64e7f..7fe081e 100644
--- a/Makefile
+++ b/Makefile
@@ -286,6 +286,7 @@ lwip: toolchain sdk_patch
 ifeq ($(STANDALONE),y)
 	make -C esp-open-lwip -f Makefile.open install \
 	    CC=$(TOOLCHAIN)/bin/xtensa-lx106-elf-gcc \
+	    AR=$(TOOLCHAIN)/bin/xtensa-lx106-elf-ar \
 	    PREFIX=$(TOOLCHAIN)
 	cp -a esp-open-lwip/include/arch esp-open-lwip/include/lwip esp-open-lwip/include/netif \
 	    esp-open-lwip/include/lwipopts.h \