diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index e329ac9559..78b76d103e 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -1407,7 +1407,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
         v->pquantizer = get_bits1(gb);
     if(v->postprocflag)
-        v->postproc = get_bits1(gb);
+        v->postproc = get_bits(gb, 2);
 
     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;