diff --git a/apps/registration/forms.py b/apps/registration/forms.py
index 24e3588..5c4aec3 100644
--- a/apps/registration/forms.py
+++ b/apps/registration/forms.py
@@ -72,12 +72,13 @@ class PhotoAuthorizationForm(forms.ModelForm):
     Form to send a photo authorization.
     """
     def clean_photo_authorization(self):
-        if "photo_authorization" not in self.files:
-            raise ValidationError(_("The uploaded file size must be under 2 Mo."))
-        file = self.files["photo_authorization"]
-        if file.content_type not in ["application/pdf", "image/png", "image/jpeg"]:
-            raise ValidationError(_("The uploaded file must be a PDF, PNG of JPEG file."))
-        return self.cleaned_data["photo_authorization"]
+        if "photo_authorization" in self.files:
+            file = self.files["photo_authorization"]
+            if file.size > 2e6:
+                raise ValidationError(_("The uploaded file size must be under 2 Mo."))
+            if file.content_type not in ["application/pdf", "image/png", "image/jpeg"]:
+                raise ValidationError(_("The uploaded file must be a PDF, PNG of JPEG file."))
+            return self.cleaned_data["photo_authorization"]
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
diff --git a/nginx_corres2math.conf b/nginx_corres2math.conf
index e4b01f0..06900b2 100644
--- a/nginx_corres2math.conf
+++ b/nginx_corres2math.conf
@@ -5,6 +5,7 @@ upstream corres2math {
 server {
     listen 80;
     server_name corres2math;
+    client_max_body_size 50M;
 
     location / {
             proxy_pass http://corres2math;