diff --git a/filters/f_lavfi.h b/filters/f_lavfi.h
index ec6990f68a..b86ed90efd 100644
--- a/filters/f_lavfi.h
+++ b/filters/f_lavfi.h
@@ -31,6 +31,7 @@ struct mp_lavfi *mp_lavfi_create_filter(struct mp_filter *parent,
                                         char **graph_opts,
                                         const char *filter, char **filter_opts);
 
+struct mp_log;
 // Print libavfilter list for --vf/--af
 void print_lavfi_help_list(struct mp_log *log, int media_type);
 
diff --git a/sub/ass_mp.h b/sub/ass_mp.h
index e581f939e8..dc83e31ed6 100644
--- a/sub/ass_mp.h
+++ b/sub/ass_mp.h
@@ -42,6 +42,7 @@ struct MPOpts;
 struct mpv_global;
 struct mp_osd_res;
 struct osd_style_opts;
+struct mp_log;
 
 void mp_ass_flush_old_events(ASS_Track *track, long long ts);
 void mp_ass_set_style(ASS_Style *style, double res_y,