diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 13119bd0b3..9df778bcab 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -1319,16 +1319,17 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         break;
     }
 
-    if (v->fcm != PROGRESSIVE && !v->s.quarter_sample) {
-        v->range_x <<= 1;
-        v->range_y <<= 1;
-    }
 
     /* AC Syntax */
     v->c_ac_table_index = decode012(gb);
     if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) {
         v->y_ac_table_index = decode012(gb);
     }
+    else if (v->fcm != PROGRESSIVE && !v->s.quarter_sample) {
+        v->range_x <<= 1;
+        v->range_y <<= 1;
+    }
+
     /* DC Syntax */
     v->s.dc_table_index = get_bits1(gb);
     if ((v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)