diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index a0b5950784..a3f4e052ce 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1693,7 +1693,8 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_
 
     if (!s->pb->seekable) {
         if (!mkv->dyn_bc) {
-            if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
+            ret = avio_open_dyn_buf(&mkv->dyn_bc);
+            if (ret < 0) {
                 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
                 return ret;
             }