diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index b0e5ae9adc..00ce2a4496 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2152,8 +2152,6 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
     if (check_marker(&s->gb, "in sequence header") == 0) {
         return AVERROR_INVALIDDATA;
     }
-    s->width  = width;
-    s->height = height;
 
     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
     skip_bits(&s->gb, 1);
@@ -2185,6 +2183,9 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
         return AVERROR_INVALIDDATA;
     }
 
+    s->width  = width;
+    s->height = height;
+
     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
     s->progressive_sequence = 1;
     s->progressive_frame    = 1;