diff --git a/box-drawing.c b/box-drawing.c
index bca651da..0d51e704 100644
--- a/box-drawing.c
+++ b/box-drawing.c
@@ -1511,7 +1511,7 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
     }
 }
 
-struct fcft_glyph *
+struct fcft_glyph * COLD
 box_drawing(const struct terminal *term, wchar_t wc)
 {
     int width = term->cell_width;