diff --git a/libavformat/rtmpproto.c b/libavformat/rtmpproto.c
index fa661ee552..598122a229 100644
--- a/libavformat/rtmpproto.c
+++ b/libavformat/rtmpproto.c
@@ -50,7 +50,7 @@
 
 //#define DEBUG
 
-#define APP_MAX_LENGTH 128
+#define APP_MAX_LENGTH 1024
 #define PLAYPATH_MAX_LENGTH 256
 #define TCURL_MAX_LENGTH 512
 #define FLASHVER_MAX_LENGTH 64
@@ -312,7 +312,7 @@ static int gen_connect(URLContext *s, RTMPContext *rt)
     int ret;
 
     if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
-                                     0, 4096)) < 0)
+                                     0, 4096 + APP_MAX_LENGTH)) < 0)
         return ret;
 
     p = pkt.data;