diff --git a/libavcodec/h2645_sei.c b/libavcodec/h2645_sei.c
index 638362fbf6..c9fb25b1da 100644
--- a/libavcodec/h2645_sei.c
+++ b/libavcodec/h2645_sei.c
@@ -629,15 +629,15 @@ static int h2645_sei_to_side_data(AVCodecContext *avctx, H2645SEI *sei,
             return AVERROR(ENOMEM);
         }
 
+        dst_env->ambient_illuminance = av_make_q(env->ambient_illuminance, 10000);
+        dst_env->ambient_light_x     = av_make_q(env->ambient_light_x,     50000);
+        dst_env->ambient_light_y     = av_make_q(env->ambient_light_y,     50000);
+
         ret = ff_frame_new_side_data_from_buf_ext(avctx, sd, nb_sd,
                                                   AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT, &buf);
 
         if (ret < 0)
             return ret;
-
-        dst_env->ambient_illuminance = av_make_q(env->ambient_illuminance, 10000);
-        dst_env->ambient_light_x     = av_make_q(env->ambient_light_x,     50000);
-        dst_env->ambient_light_y     = av_make_q(env->ambient_light_y,     50000);
     }
 
     if (sei->mastering_display.present) {