diff --git a/lib/doc/fr/UserGuide.lyx b/lib/doc/fr/UserGuide.lyx
index 499b32e694..73fb95a4bf 100644
--- a/lib/doc/fr/UserGuide.lyx
+++ b/lib/doc/fr/UserGuide.lyx
@@ -64,7 +64,7 @@ logicalmkup
 \inputencoding auto
 \fontencoding global
 \font_roman "lmodern" "default"
-\font_sans "cmss" "default"
+\font_sans "lmss" "default"
 \font_typewriter "lmtt" "default"
 \font_math "auto" "auto"
 \font_default_family default