diff --git a/frontend/tty-receiver/assets/fonts/fmt_fonts.py b/frontend/tty-receiver/assets/fonts/fmt_fonts.py
index 56605f3..a4394ce 100644
--- a/frontend/tty-receiver/assets/fonts/fmt_fonts.py
+++ b/frontend/tty-receiver/assets/fonts/fmt_fonts.py
@@ -46,7 +46,7 @@ for font in p.iterdir():
   font-family: {family};
   font-style: {css_style};
   font-weight: {css_weight};
-  src: url("assets/fonts/{font.name}");
+  src: url("assets/fonts/{font.name}") format("truetype");
 }}           
 """]