diff --git a/app/scodoc/sco_assiduites.py b/app/scodoc/sco_assiduites.py
index 00bc4922..487556ab 100644
--- a/app/scodoc/sco_assiduites.py
+++ b/app/scodoc/sco_assiduites.py
@@ -188,7 +188,7 @@ class CountCalculator:
         if assi.etat != scu.EtatAssiduite.PRESENT:
             _key: str = scu.EtatAssiduite.inverse().get(assi.etat).name.lower()
             if key not in self.data[_key]["demi"]:
-                self.data[_key]["demi"].append(day)
+                self.data[_key]["demi"].append(key)
 
         if key not in self.data["total"]["demi"]:
             self.data["total"]["demi"].append(key)
@@ -663,7 +663,7 @@ def get_assiduites_count_in_interval(
 
         calculator: CountCalculator = CountCalculator()
         calculator.compute_assiduites(assiduites)
-        calcul : dict = calculator.to_dict(only_total=False)
+        calcul: dict = calculator.to_dict(only_total=False)
         nb_abs: dict = calcul["absent"][metrique]
         nb_abs_just: dict = calcul["absent_just"][metrique]
 
diff --git a/app/views/assiduites.py b/app/views/assiduites.py
index 5e1a4b0b..73f99790 100644
--- a/app/views/assiduites.py
+++ b/app/views/assiduites.py
@@ -1492,7 +1492,9 @@ def tableau_assiduite_actions():
         )
 
         compute_assiduites_justified(objet.etudiant.id, [justificatif_correspondant])
-
+        scass.simple_invalidate_cache(
+            justificatif_correspondant.to_dict(), objet.etudiant.id
+        )
         flash(f"{objet_name} justifiée")
         return redirect(request.referrer)
 
diff --git a/tests/unit/test_assiduites.py b/tests/unit/test_assiduites.py
index 3f2d40da..12b34b80 100644
--- a/tests/unit/test_assiduites.py
+++ b/tests/unit/test_assiduites.py
@@ -1307,6 +1307,19 @@ def test_calcul_assiduites(test_client):
             scu.EtatAssiduite.ABSENT,
             False,
         ),
+        # 18/12
+        (
+            "12-18T08:00",
+            "12-18T10:00",
+            scu.EtatAssiduite.ABSENT,
+            False,
+        ),
+        (
+            "12-18T10:00",
+            "12-18T12:00",
+            scu.EtatAssiduite.ABSENT,
+            False,
+        ),
     ]
 
     for ass in assiduites:
@@ -1333,17 +1346,17 @@ def test_calcul_assiduites(test_client):
     resultat_attendu: dict = {
         "present": {"journee": 5, "demi": 8, "heure": 13.25, "compte": 9},
         "absent": {
-            "journee": 5 + 5,
-            "demi": 7 + 10,
-            "heure": 11.25 + 42,
-            "compte": 7 + 1,
+            "journee": 6 + 5,
+            "demi": 8 + 10,
+            "heure": 15.25 + 42,
+            "compte": 9 + 1,
         },
         "absent_just": {"journee": 3, "demi": 3, "heure": 4.25, "compte": 3},
         "absent_non_just": {
-            "journee": 3 + 5,
-            "demi": 4 + 10,
-            "heure": 7 + 42,
-            "compte": 4 + 1,
+            "journee": 4 + 5,
+            "demi": 5 + 10,
+            "heure": 11 + 42,
+            "compte": 6 + 1,
         },
         "retard": {
             "journee": 5,
@@ -1353,9 +1366,14 @@ def test_calcul_assiduites(test_client):
         },
         "retard_just": {"journee": 3, "demi": 3, "heure": 2.5, "compte": 3},
         "retard_non_just": {"journee": 3, "demi": 4, "heure": 8.0, "compte": 4},
-        "total": {"journee": 10, "demi": 19, "heure": 77.0, "compte": 24},
+        "total": {"journee": 11, "demi": 20, "heure": 81.0, "compte": 26},
     }
 
+    for key in resultat_attendu:
+        assert (
+            resultat_attendu[key]["journee"] * 2 >= resultat_attendu[key]["demi"]
+        ), f"Trop de demi-journées [{key}]"
+
     for key in resultat_attendu:
         for key2 in resultat_attendu[key]:
             assert (