diff --git a/app/scodoc/notesdb.py b/app/scodoc/notesdb.py
index b03b5427d9..9be12f3954 100644
--- a/app/scodoc/notesdb.py
+++ b/app/scodoc/notesdb.py
@@ -602,15 +602,15 @@ BOOL_STR = {
     "false": False,
     "0": False,
     "1": True,
-    "true": "true",
+    "true": True,
 }
 
 
-def bool_or_str(x):
+def bool_or_str(x) -> bool:
     """a boolean, may also be encoded as a string "0", "False",  "1", "True" """
     if isinstance(x, str):
         return BOOL_STR[x.lower()]
-    return x
+    return bool(x)
 
 
 # post filtering
diff --git a/app/scodoc/sco_abs_views.py b/app/scodoc/sco_abs_views.py
index 50984e04eb..b21cb8c0b8 100644
--- a/app/scodoc/sco_abs_views.py
+++ b/app/scodoc/sco_abs_views.py
@@ -790,7 +790,8 @@ def ListeAbsEtud(
         absjust_only: si vrai, renvoie table absences justifiées
         sco_year: année scolaire à utiliser. Si non spécifier, utilie l'année en cours. e.g. "2005"
     """
-    absjust_only = int(absjust_only)  # si vrai, table absjust seule (export xls ou pdf)
+    # si absjust_only, table absjust seule (export xls ou pdf)
+    absjust_only = ndb.bool_or_str(absjust_only)
     datedebut = "%s-08-01" % scu.AnneeScolaire(sco_year=sco_year)
 
     etud = sco_etud.get_etud_info(etudid=etudid, filled=True)[0]