diff --git a/libavcodec/movtextdec.c b/libavcodec/movtextdec.c
index 6de15004fc..fb5085c3e8 100644
--- a/libavcodec/movtextdec.c
+++ b/libavcodec/movtextdec.c
@@ -459,6 +459,8 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
     end = ptr + FFMIN(2 + text_length, avpkt->size);
     ptr += 2;
 
+    mov_text_cleanup(m);
+
     tsmb_size = 0;
     m->tracksize = 2 + text_length;
     m->style_entries = 0;