diff --git a/platform/avr-ravenusb/contiki-conf.h b/platform/avr-ravenusb/contiki-conf.h
index 8eab7cce9..d73b16ed1 100644
--- a/platform/avr-ravenusb/contiki-conf.h
+++ b/platform/avr-ravenusb/contiki-conf.h
@@ -434,7 +434,9 @@ typedef unsigned short uip_stats_t;
 #undef UIP_CONF_TCP            
 #define UIP_CONF_TCP                1
 #define UIP_CONF_TCP_MSS           48
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW    48
+#endif
 #undef NBR_TABLE_CONF_MAX_NEIGHBORS
 #define NBR_TABLE_CONF_MAX_NEIGHBORS        5
 #undef UIP_CONF_MAX_ROUTES
diff --git a/platform/econotag/contiki-conf.h b/platform/econotag/contiki-conf.h
index 2b29867ef..963a9799c 100644
--- a/platform/econotag/contiki-conf.h
+++ b/platform/econotag/contiki-conf.h
@@ -212,7 +212,9 @@
 
 #define UIP_CONF_DHCP_LIGHT
 #define UIP_CONF_LLH_LEN         0
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW  48
+#endif
 #define UIP_CONF_TCP_MSS         48
 #define UIP_CONF_MAX_CONNECTIONS 4
 #define UIP_CONF_MAX_LISTENPORTS 8
diff --git a/platform/ev-aducrf101mkxz/contiki-conf.h b/platform/ev-aducrf101mkxz/contiki-conf.h
index 673a358ab..ce9469b7a 100644
--- a/platform/ev-aducrf101mkxz/contiki-conf.h
+++ b/platform/ev-aducrf101mkxz/contiki-conf.h
@@ -159,7 +159,9 @@
 
 #define UIP_CONF_DHCP_LIGHT
 #define UIP_CONF_LLH_LEN                0
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW         48
+#endif
 #define UIP_CONF_TCP_MSS                48
 #define UIP_CONF_MAX_CONNECTIONS        4
 #define UIP_CONF_MAX_LISTENPORTS        4
diff --git a/platform/eval-adf7xxxmb4z/contiki-conf.h b/platform/eval-adf7xxxmb4z/contiki-conf.h
index 965bb16cd..ad64b392f 100644
--- a/platform/eval-adf7xxxmb4z/contiki-conf.h
+++ b/platform/eval-adf7xxxmb4z/contiki-conf.h
@@ -162,7 +162,9 @@
 
 #define UIP_CONF_DHCP_LIGHT
 #define UIP_CONF_LLH_LEN         0
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW  48
+#endif
 #define UIP_CONF_TCP_MSS         48
 #define UIP_CONF_MAX_CONNECTIONS 4
 #define UIP_CONF_MAX_LISTENPORTS 8
diff --git a/platform/micaz/contiki-conf.h b/platform/micaz/contiki-conf.h
index 50e2ace1e..9f9b8ded1 100644
--- a/platform/micaz/contiki-conf.h
+++ b/platform/micaz/contiki-conf.h
@@ -179,7 +179,9 @@
 
 #define UIP_CONF_DHCP_LIGHT
 #define UIP_CONF_LLH_LEN         0
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW  48
+#endif
 #define UIP_CONF_TCP_MSS         48
 #define UIP_CONF_MAX_CONNECTIONS 4
 #define UIP_CONF_MAX_LISTENPORTS 8
diff --git a/platform/native/contiki-conf.h b/platform/native/contiki-conf.h
index 03eacbbde..7ac497468 100644
--- a/platform/native/contiki-conf.h
+++ b/platform/native/contiki-conf.h
@@ -141,7 +141,9 @@ typedef unsigned short uip_stats_t;
 #define UIP_CONF_ICMP_DEST_UNREACH 1
 
 #define UIP_CONF_DHCP_LIGHT
+#ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW  48
+#endif
 #define UIP_CONF_TCP_MSS         48
 #define UIP_CONF_UDP_CONNS       12
 #define UIP_CONF_FWCACHE_SIZE    30