diff --git a/libavformat/asfenc.c b/libavformat/asfenc.c
index 029ccad1d6..c61335b776 100644
--- a/libavformat/asfenc.c
+++ b/libavformat/asfenc.c
@@ -192,7 +192,6 @@ typedef struct ASFStream {
     AVPacket pkt;
     int frag_offset;
     int timestamp;
-    int64_t duration;
 
     int ds_span;                /* descrambling  */
     int ds_packet_size;