diff --git a/libports/lib/mk/lwip.mk b/libports/lib/mk/lwip.mk
index f4d2b8b52d..1775a73332 100644
--- a/libports/lib/mk/lwip.mk
+++ b/libports/lib/mk/lwip.mk
@@ -27,7 +27,7 @@ SRC_C   += etharp.c
 
 LIBS     = thread cxx alarm signal libc timed_semaphore
 
-D_OPTS   = ERRNO
+D_OPTS   = ERRNO SO_REUSE
 D_OPTS  := $(addprefix -D,$(D_OPTS))
 CC_DEF  += $(D_OPTS)