diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c
index 21141fa052..ac0b8252e4 100644
--- a/libavcodec/vmnc.c
+++ b/libavcodec/vmnc.c
@@ -484,6 +484,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
+        return AVERROR_PATCHWELCOME;
     }
 
     return 0;