diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c
index 8cc78fa4c0..b1c4cbd1b7 100644
--- a/libavcodec/vmnc.c
+++ b/libavcodec/vmnc.c
@@ -483,6 +483,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
+        return AVERROR_INVALIDDATA;
     }
 
     return 0;