diff --git a/app/models/avis.rb b/app/models/avis.rb
index 51da59ce1..62d89b8ad 100644
--- a/app/models/avis.rb
+++ b/app/models/avis.rb
@@ -24,6 +24,14 @@ class Avis < ApplicationRecord
   has_one_attached :piece_justificative_file
   has_one_attached :introduction_file
 
+  validates :piece_justificative_file,
+    content_type: AUTHORIZED_CONTENT_TYPES,
+    size: { less_than: 20.megabytes }
+
+  validates :introduction_file,
+    content_type: AUTHORIZED_CONTENT_TYPES,
+    size: { less_than: 20.megabytes }
+
   validates :email, format: { with: Devise.email_regexp, message: "n'est pas valide" }, allow_nil: true
   validates :claimant, presence: true
   validates :piece_justificative_file, size: { less_than: 20.megabytes }
diff --git a/app/models/commentaire.rb b/app/models/commentaire.rb
index de8988d47..d55a5ce69 100644
--- a/app/models/commentaire.rb
+++ b/app/models/commentaire.rb
@@ -22,7 +22,10 @@ class Commentaire < ApplicationRecord
   has_one_attached :piece_jointe
 
   validates :body, presence: { message: "ne peut être vide" }
-  validates :piece_jointe, size: { less_than: 20.megabytes }
+
+  validates :piece_jointe,
+    content_type: AUTHORIZED_CONTENT_TYPES,
+    size: { less_than: 20.megabytes }
 
   default_scope { order(created_at: :asc) }
   scope :updated_since?, -> (date) { where('commentaires.updated_at > ?', date) }