diff --git a/libavformat/icodec.c b/libavformat/icodec.c
index 040e454c55..c07238ec67 100644
--- a/libavformat/icodec.c
+++ b/libavformat/icodec.c
@@ -124,12 +124,14 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
     IcoDemuxContext *ico = s->priv_data;
     IcoImage *image;
     AVIOContext *pb = s->pb;
-    AVStream *st = s->streams[0];
+    AVStream *st;
     int ret;
 
     if (ico->current_image >= ico->nb_images)
         return AVERROR(EIO);
 
+    st = s->streams[0];
+
     image = &ico->images[ico->current_image];
 
     if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0)