diff --git a/Makefile b/Makefile
index b44e227..559f599 100644
--- a/Makefile
+++ b/Makefile
@@ -392,7 +392,7 @@ nativetest:
 	@date +"Build script finished on %F %T"
 ztproxy:
 	$(CXX) $(CXXFLAGS) $(SANFLAGS) $(LIBZT_INCLUDES) $(LIBZT_DEFS) $(ZT_INCLUDES) \
-		examples/apps/ztproxy/ztproxy.cpp -o $(BUILD)/ztproxy $< -L$(BUILD) -lzt $(WINDEFS)
+		examples/apps/ztproxy/ztproxy.cpp -o $(BUILD)/ztproxy $< -L$(BUILD) -lzt -lpthread $(WINDEFS)
 	@./check.sh $(BUILD)/ztproxy
 	@date +"Build script finished on %F %T"
 intercept:
diff --git a/src/libzt.cpp b/src/libzt.cpp
index d808dec..49407c3 100644
--- a/src/libzt.cpp
+++ b/src/libzt.cpp
@@ -84,6 +84,7 @@ void fix_addr_socket_family(struct sockaddr *addr)
 	so we must compensate here before feeding it into the stack. Due to this limitation 
 	we must cast the pointer to the address into two different address 
 	*/
+#if defined(STACK_LWIP)
 	if (addr->sa_len == 2) {
 		if (addr->sa_family == 0) {
 			addr->sa_family = addr->sa_len;
@@ -96,6 +97,7 @@ void fix_addr_socket_family(struct sockaddr *addr)
 			addr->sa_len = 0;
 		}
 	}
+#endif
 	/* once we've moved the value to its anticipated location, convert it from
 	its platform-specific value to one that the network stack can work with */ 
 #endif