diff --git a/include/types/stream.h b/include/types/stream.h
index eb31f06..90819e6 100644
--- a/include/types/stream.h
+++ b/include/types/stream.h
@@ -56,7 +56,7 @@
 #define SF_CURR_SESS	0x00000040	/* a connection is currently being counted on the server */
 /* unused: 0x00000080 */
 #define SF_REDISP	0x00000100	/* set if this stream was redispatched from one server to another */
-/* unused: 0x00000200 */
+#define SF_IGNORE	0x00000200      /* The stream lead to a mux upgrade, and should be ignored */
 #define SF_REDIRECTABLE	0x00000400	/* set if this stream is redirectable (GET or HEAD) */
 #define SF_HTX          0x00000800      /* set if this stream is an htx stream */