diff --git a/cours/cours_beamer.cls b/cours/cours_beamer.cls
index 4745bbc..b1a2e8a 100644
--- a/cours/cours_beamer.cls
+++ b/cours/cours_beamer.cls
@@ -62,7 +62,8 @@
 \usetheme{Madrid}
 \useinnertheme{circles}
 \useoutertheme{default}
-\usefonttheme[onlymath]{serif}
+% \usefonttheme[onlymath]{serif}
+\usefonttheme{professionalfonts}
 \usecolortheme[named=\firstcolor]{structure}
 
 % enumerate