diff --git a/libavformat/microdvddec.c b/libavformat/microdvddec.c
index 5e37bc38a3..b1229fae01 100644
--- a/libavformat/microdvddec.c
+++ b/libavformat/microdvddec.c
@@ -62,7 +62,7 @@ static int microdvd_read_header(AVFormatContext *s)
     char c;
 
     if (!st)
-        return -1;
+        return AVERROR(ENOMEM);
     for (i=0; i<FF_ARRAY_ELEMS(microdvd->lines); i++) {
         microdvd->pos[i] = avio_tell(s->pb);
         ff_get_line(s->pb, microdvd->lines[i], sizeof(microdvd->lines[i]));
diff --git a/libavformat/srtdec.c b/libavformat/srtdec.c
index 481f4a6bb0..9cd393ef7f 100644
--- a/libavformat/srtdec.c
+++ b/libavformat/srtdec.c
@@ -44,7 +44,7 @@ static int srt_read_header(AVFormatContext *s)
 {
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
-        return -1;
+        return AVERROR(ENOMEM);
     avpriv_set_pts_info(st, 64, 1, 1000);
     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codec->codec_id   = CODEC_ID_SRT;