1 files changed, 1 insertions, 1 deletions
diff --git a/ass_mp.h b/ass_mp.h
index a0b3f107b9..be67a66cf6 100644
--- a/ass_mp.h
+++ b/ass_mp.h
@@ -48,7 +48,7 @@ ASS_Track *ass_default_track(ASS_Library *library);
 int ass_process_subtitle(ASS_Track *track, subtitle *sub);
 ASS_Track *ass_read_subdata(ASS_Library *library, sub_data *subdata,
                             double fps);
-ASS_Track *ass_read_stream(ASS_Library *library, char *fname, char *charset);
+ASS_Track *ass_read_stream(ASS_Library *library, const char *fname, char *charset);
 
 void ass_configure(ASS_Renderer *priv, int w, int h, int hinting);
 void ass_configure_fonts(ASS_Renderer *priv);