diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index d184c34b81..102551972e 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -701,12 +701,12 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
             if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
                 return ret;
         }
-        ff_thread_finish_setup(avctx);
-
         p->pict_type        = AV_PICTURE_TYPE_I;
         p->key_frame        = 1;
         p->interlaced_frame = !!s->interlace_type;
 
+        ff_thread_finish_setup(avctx);
+
         /* compute the compressed row size */
         if (!s->interlace_type) {
             s->crow_size = s->row_size + 1;