diff --git a/platform/win32/contiki-conf.h b/platform/win32/contiki-conf.h
index 26b4fed28..1e0eb68e0 100644
--- a/platform/win32/contiki-conf.h
+++ b/platform/win32/contiki-conf.h
@@ -54,6 +54,7 @@ typedef unsigned short uip_stats_t;
 #define UIP_CONF_BUFFER_SIZE     420
 #define UIP_CONF_BYTE_ORDER      UIP_LITTLE_ENDIAN
 #define UIP_CONF_TCP_SPLIT       1
+#define UIP_CONF_IP_FORWARD      1
 #define UIP_CONF_LOGGING         1
 #define UIP_CONF_UDP_CHECKSUMS   1