diff --git a/examples/osd/rpl-border-router/project-conf.h b/examples/osd/rpl-border-router/project-conf.h
index bfc5031f5..da3c04e6d 100644
--- a/examples/osd/rpl-border-router/project-conf.h
+++ b/examples/osd/rpl-border-router/project-conf.h
@@ -53,9 +53,9 @@
 #define QUEUEBUF_CONF_NUM          4
 #endif
 
-#ifndef UIP_CONF_BUFFER_SIZE
-#define UIP_CONF_BUFFER_SIZE    140
-#endif
+#undef UIP_CONF_BUFFER_SIZE
+#define UIP_CONF_BUFFER_SIZE    256
+
 
 #ifndef UIP_CONF_RECEIVE_WINDOW
 #define UIP_CONF_RECEIVE_WINDOW  60