diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index 437fbd2a7..1d87dd735 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -119,7 +119,7 @@ class Procedure < ApplicationRecord
   end
 
   has_many :administrateurs_procedures, dependent: :delete_all
-  has_many :administrateurs, through: :administrateurs_procedures, after_remove: -> (procedure, _admin) { procedure.validate! }
+  has_many :administrateurs, through: :administrateurs_procedures, before_remove: :check_administrateur_minimal_presence
   has_many :groupe_instructeurs, -> { order(:label) }, inverse_of: :procedure, dependent: :destroy
   has_many :instructeurs, through: :groupe_instructeurs
   has_many :export_templates, through: :groupe_instructeurs
@@ -318,6 +318,12 @@ class Procedure < ApplicationRecord
     end
   end
 
+  def check_administrateur_minimal_presence(_object)
+    if self.administrateurs.count <= 1
+      raise ActiveRecord::RecordNotDestroyed.new("Cannot remove the last administrateur of procedure #{self.libelle} (#{self.id})")
+    end
+  end
+
   def dossiers_close_to_expiration
     dossiers.close_to_expiration.count
   end