diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c
index 46bd52ee267e83fa5c056972519f876c18bb5cf1..aef3df37a93f113bc122a1156a153e3526347cb7 100644
--- a/libavcodec/vmnc.c
+++ b/libavcodec/vmnc.c
@@ -538,7 +538,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         avctx->pix_fmt = AV_PIX_FMT_RGB555;
         break;
     case 32:
-        avctx->pix_fmt = AV_PIX_FMT_RGB32;
+        avctx->pix_fmt = AV_PIX_FMT_0RGB32;
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);