diff --git a/make-liblwip.mk b/make-liblwip.mk
index 90a8d54..a841b35 100644
--- a/make-liblwip.mk
+++ b/make-liblwip.mk
@@ -103,13 +103,14 @@ LWIPFILES=$(COREFILES) $(APIFILES) $(NETIFFILES) $(ARCHFILES)
 
 ifeq ($(LIBZT_IPV4),1)
 	LWIPFILES+=$(CORE4FILES)
-	CFLAGS+=-DLIBZT_IPV4=1 -DLWIP_IPV4 -DLWIP_IPV6=0 -DIPv4 
-	#-DLWIP_DEBUG=1
+	CFLAGS+=-DLIBZT_IPV4=1 -DLWIP_IPV4 -DLWIP_IPV6=0 -DIPv4
 endif
 ifeq ($(LIBZT_IPV6),1)
 	LWIPFILES+=$(CORE6FILES)
 	CFLAGS+=-DLIBZT_IPV6=1 -DLWIP_IPV6 -DLWIP_IPV4=0 -DIPv6 
-	#-DLWIP_DEBUG=1
+endif
+ifeq ($(LWIP_DEBUG),1)
+	CFLAGS+=-DLWIP_DEBUG=1
 endif
 
 LWIPFILESW=$(wildcard $(LWIPFILES))