diff --git a/app/models/siret.rb b/app/models/siret.rb
index de274b5a1..0bac4702b 100644
--- a/app/models/siret.rb
+++ b/app/models/siret.rb
@@ -1,7 +1,15 @@
 class Siret
   include ActiveModel::Model
+  include ActiveModel::Validations::Callbacks
+
   attr_accessor :siret
 
   validates_presence_of :siret
   validates :siret, siret_format: true
+
+  before_validation :remove_whitespace
+
+  def remove_whitespace
+    siret.delete!(' ')
+  end
 end