diff --git a/src/subtitles_provider_libass.cpp b/src/subtitles_provider_libass.cpp
index 815c820da..f497bdb34 100644
--- a/src/subtitles_provider_libass.cpp
+++ b/src/subtitles_provider_libass.cpp
@@ -170,6 +170,8 @@ LibassSubtitlesProvider::~LibassSubtitlesProvider() {
 
 void LibassSubtitlesProvider::DrawSubtitles(VideoFrame &frame,double time) {
 	ass_set_frame_size(renderer(), frame.width, frame.height);
+	// Note: this relies on Aegisub always rendering at video storage res
+	ass_set_storage_size(renderer(), frame.width, frame.height);
 
 	ASS_Image* img = ass_render_frame(renderer(), ass_track, int(time * 1000), nullptr);
 
diff --git a/subprojects/csri/backends/libass/libass_csri.c b/subprojects/csri/backends/libass/libass_csri.c
index 295b182d6..7447b2a84 100644
--- a/subprojects/csri/backends/libass/libass_csri.c
+++ b/subprojects/csri/backends/libass/libass_csri.c
@@ -105,6 +105,8 @@ int csri_request_fmt(csri_inst *inst, const struct csri_fmt *fmt)
 	if (!csri_is_rgb(fmt->pixfmt) || csri_has_alpha(fmt->pixfmt))
 		return -1;
 	ass_set_frame_size(inst->ass_renderer, fmt->width, fmt->height);
+	// Note: this relies on CSRI always rendering at video storage res
+	ass_set_storage_size(inst->ass_renderer, fmt->width, fmt->height);
 	return 0;
 }