diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index f28f7e886b..4a40cf96d6 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -815,6 +815,7 @@ static void clear_context(MpegEncContext *s)
 
     s->parse_context.buffer = NULL;
     s->parse_context.buffer_size = 0;
+    s->parse_context.overread = 0;
     s->bitstream_buffer = NULL;
     s->allocated_bitstream_buffer_size = 0;
     s->picture          = NULL;