diff --git a/app/models/departements.py b/app/models/departements.py
index 8c5df10ce..6f3f77598 100644
--- a/app/models/departements.py
+++ b/app/models/departements.py
@@ -2,12 +2,15 @@
 
 """ScoDoc models : departements
 """
+import re
 
 from app import db
 from app.models import SHORT_STR_LEN
 from app.models.preferences import ScoPreference
 from app.scodoc.sco_exceptions import ScoValueError
 
+VALID_DEPT_EXP = re.compile(r"^[\w@\\\-\.]+$")
+
 
 class Departement(db.Model):
     """Un département ScoDoc"""
@@ -60,6 +63,15 @@ class Departement(db.Model):
             }
         return data
 
+    @classmethod
+    def invalid_dept_acronym(cls, dept_acronym: str) -> bool:
+        "Check that dept_acronym is invalid"
+        return (
+            not dept_acronym
+            or (len(dept_acronym) >= SHORT_STR_LEN)
+            or not VALID_DEPT_EXP.match(dept_acronym)
+        )
+
     @classmethod
     def from_acronym(cls, acronym):
         dept = cls.query.filter_by(acronym=acronym).first_or_404()
@@ -70,6 +82,8 @@ def create_dept(acronym: str, visible=True) -> Departement:
     "Create new departement"
     from app.models import ScoPreference
 
+    if Departement.invalid_dept_acronym(acronym):
+        raise ScoValueError("acronyme departement invalide")
     existing = Departement.query.filter_by(acronym=acronym).count()
     if existing:
         raise ScoValueError(f"acronyme {acronym} déjà existant")