diff --git a/app/scodoc/sco_formsemestre_edit.py b/app/scodoc/sco_formsemestre_edit.py
index f056a3e62..7174cfc3d 100644
--- a/app/scodoc/sco_formsemestre_edit.py
+++ b/app/scodoc/sco_formsemestre_edit.py
@@ -545,7 +545,7 @@ def do_formsemestre_createwithmodules(edit=False):
     for semestre_id in semestre_ids:
         if formation.is_apc():
             # pour restreindre l'édition aux module du semestre sélectionné
-            tr_class = 'class="sem{semestre_id}"'
+            tr_class = f'class="sem{semestre_id}"'
         else:
             tr_class = ""
         if edit: