diff --git a/streetup/interventions/services/export_service.py b/streetup/interventions/services/export_service.py
index 22596ae..c0637fb 100644
--- a/streetup/interventions/services/export_service.py
+++ b/streetup/interventions/services/export_service.py
@@ -19,8 +19,11 @@ import io
 _ILLEGAL_CHARS_RE = re.compile(r'[\x00-\x08\x0b\x0c\x0e-\x1f]')
 
 
+from django.utils.functional import Promise
 def _sanitize_cell_value(value):
     """Supprime les caractères illégaux d'une valeur avant de l'écrire dans une cellule Excel."""
+    if isinstance(value, Promise):
+        value = str(value)
     if isinstance(value, str):
         return _ILLEGAL_CHARS_RE.sub('', value)
     return value
@@ -160,7 +163,7 @@ def generate_interventions_excel(start_date=None, end_date=None, output_format='
     # Écrire les en-têtes avec style
     for col_num, header in enumerate(headers, 1):
         cell = ws.cell(row=1, column=col_num)
-        cell.value = header
+        cell.value = str(header)
         cell.font = Font(bold=True, color="FFFFFF")
         cell.fill = PatternFill(start_color="366092", end_color="366092", fill_type="solid")
         cell.alignment = Alignment(horizontal="center", vertical="center")
diff --git a/streetup/interventions/views/general.py b/streetup/interventions/views/general.py
index 1214480..7405899 100644
--- a/streetup/interventions/views/general.py
+++ b/streetup/interventions/views/general.py
@@ -1000,7 +1000,10 @@ def export_interventions(request):
 
         _illegal_chars_re = re.compile(r'[\x00-\x08\x0b\x0c\x0e-\x1f]')
 
+        from django.utils.functional import Promise
         def _sanitize_xlsx(value):
+            if isinstance(value, Promise):
+                value = str(value)
             if isinstance(value, str):
                 return _illegal_chars_re.sub('', value)
             return value
@@ -1010,7 +1013,7 @@ def export_interventions(request):
         ws.title = 'Interventions'
 
         # headers
-        ws.append([h for h, _ in columns])
+        ws.append([str(h) for h, _ in columns])
         # rows
         for i in items:
             ws.append([_sanitize_xlsx(getter(i)) for _, getter in columns])