diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
index 27e08902d6..fd1342671e 100644
--- a/ffmpeg_opt.c
+++ b/ffmpeg_opt.c
@@ -704,7 +704,7 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
             MATCH_PER_STREAM_OPT(fix_sub_duration, i, ist->fix_sub_duration, ic, st);
             MATCH_PER_STREAM_OPT(canvas_sizes, str, canvas_size, ic, st);
             if (canvas_size &&
-                av_parse_video_size(&dec->width, &dec->height, canvas_size) < 0) {
+                av_parse_video_size(&ist->dec_ctx->width, &ist->dec_ctx->height, canvas_size) < 0) {
                 av_log(NULL, AV_LOG_FATAL, "Invalid canvas size: %s.\n", canvas_size);
                 exit_program(1);
             }