diff --git a/sco_formations.py b/sco_formations.py
index 12cd6274f..c90bf7566 100644
--- a/sco_formations.py
+++ b/sco_formations.py
@@ -242,7 +242,7 @@ def formation_list_table(context, formation_id=None, args={}, REQUEST=None):
                 for s in f["sems"]
             ]
             + [
-                '<a class="stdlink" id="addSemestre%s href="formsemestre_createwithmodules?formation_id=%s&semestre_id=1">ajouter</a>'
+                '<a class="stdlink" id="addSemestre_%s href="formsemestre_createwithmodules?formation_id=%s&semestre_id=1">ajouter</a>'
                 % (f["acronyme"], f["formation_id"])
             ]
         )