diff --git a/libavcodec/ansi.c b/libavcodec/ansi.c
index 143b0aa12b..45c307f317 100644
--- a/libavcodec/ansi.c
+++ b/libavcodec/ansi.c
@@ -420,7 +420,7 @@ static int decode_frame(AVCodecContext *avctx,
             switch(buf[0]) {
             case '0': case '1': case '2': case '3': case '4':
             case '5': case '6': case '7': case '8': case '9':
-                if (s->nb_args < MAX_NB_ARGS)
+                if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
                     s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
                 break;
             case ';':