diff --git a/app/scodoc/sco_bulletins_generator.py b/app/scodoc/sco_bulletins_generator.py
index d3193ade2..c62eff057 100644
--- a/app/scodoc/sco_bulletins_generator.py
+++ b/app/scodoc/sco_bulletins_generator.py
@@ -266,10 +266,15 @@ def make_formsemestre_bulletinetud(
     bul_class_name = sco_preferences.get_preference("bul_class_name", formsemestre_id)
 
     gen_class = None
-    if infos.get("type") == "BUT" and format.startswith("pdf"):
-        gen_class = bulletin_get_class(bul_class_name + "BUT")
-    if gen_class is None:
-        gen_class = bulletin_get_class(bul_class_name)
+    for bul_class_name in (
+        sco_preferences.get_preference("bul_class_name", formsemestre_id),
+        # si pas trouvé (modifs locales bizarres ,), ré-essaye avec la valeur par défaut
+        bulletin_default_class_name(),
+    ):
+        if infos.get("type") == "BUT" and format.startswith("pdf"):
+            gen_class = bulletin_get_class(bul_class_name + "BUT")
+        if gen_class is None:
+            gen_class = bulletin_get_class(bul_class_name)
 
     if gen_class is None:
         raise ValueError(