diff --git a/lrftubes.lyx b/lrftubes.lyx
index f20fccc..d9bfc6d 100644
--- a/lrftubes.lyx
+++ b/lrftubes.lyx
@@ -16,10 +16,10 @@
 \language_package babel
 \inputencoding utf8
 \fontencoding global
-\font_roman "libertine" "FreeSerif"
+\font_roman "default" "FreeSerif"
 \font_sans "default" "Courier New"
 \font_typewriter "default" "default"
-\font_math "libertine-ntxm" "auto"
+\font_math "auto" "auto"
 \font_default_family default
 \use_non_tex_fonts false
 \font_sc false