diff --git a/aegisub/src/subtitles_provider_libass.cpp b/aegisub/src/subtitles_provider_libass.cpp
index 1347b50fe..8c7152990 100644
--- a/aegisub/src/subtitles_provider_libass.cpp
+++ b/aegisub/src/subtitles_provider_libass.cpp
@@ -127,7 +127,7 @@ void LibassSubtitlesProvider::LoadSubtitles(AssFile *subs) {
 	}
 
 	if (ass_track) ass_free_track(ass_track);
-	ass_track = ass_read_memory(library, &data[0], data.size(),(char *)"UTF-8");
+	ass_track = ass_read_memory(library, &data[0], data.size(), nullptr);
 	if (!ass_track) throw "libass failed to load subtitles.";
 }