diff --git a/libavcodec/mss2.c b/libavcodec/mss2.c
index 44b6f1f62c21bc4be9cbfefeda092824a1caff52..2562209324ceb423b8b388cb601d96f7efac4e75 100644
--- a/libavcodec/mss2.c
+++ b/libavcodec/mss2.c
@@ -388,7 +388,7 @@ static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
 
     s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
 
-    if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {
+    if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
         av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index a3b603175255360d231b9ad4b9ba0c9d555dbb1e..86806b1d2130d8fc57d41aa879a594a64e92c79f 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5464,11 +5464,11 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
     // do parse frame header
     v->pic_header_flag = 0;
     if (v->profile < PROFILE_ADVANCED) {
-        if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {
+        if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
             goto err;
         }
     } else {
-        if (ff_vc1_parse_frame_header_adv(v, &s->gb) == -1) {
+        if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {
             goto err;
         }
     }