diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 59dce4f59f..fad554f09f 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1134,7 +1134,6 @@ static void matroska_convert_tags(AVFormatContext *s)
 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
 {
     EbmlList *seekhead_list = &matroska->seekhead;
-    MatroskaSeekhead *seekhead = seekhead_list->elem;
     uint32_t level_up = matroska->level_up;
     int64_t before_pos = avio_tell(matroska->ctx->pb);
     uint32_t saved_id = matroska->current_id;
@@ -1147,6 +1146,7 @@ static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
         return;
 
     for (i=0; i<seekhead_list->nb_elem; i++) {
+        MatroskaSeekhead *seekhead = seekhead_list->elem;
         int64_t offset = seekhead[i].pos + matroska->segment_start;
 
         if (seekhead[i].pos <= before_pos