diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index c1b83f1f0..58ff1328d 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -26,7 +26,7 @@ class Dossier < ApplicationRecord
   has_many :followers_gestionnaires, through: :follows, source: :gestionnaire
   has_many :avis, dependent: :destroy
 
-  has_many :dossier_operation_logs
+  has_many :dossier_operation_logs, dependent: :destroy
 
   belongs_to :procedure
   belongs_to :user
diff --git a/lib/tasks/deployment/20181128155650_destroy_orphaned_dossier_operation_logs.rake b/lib/tasks/deployment/20181128155650_destroy_orphaned_dossier_operation_logs.rake
new file mode 100644
index 000000000..82aa61b46
--- /dev/null
+++ b/lib/tasks/deployment/20181128155650_destroy_orphaned_dossier_operation_logs.rake
@@ -0,0 +1,17 @@
+namespace :after_party do
+  desc 'Deployment task: destroy_orphaned_dossier_operation_logs'
+  task destroy_orphaned_dossier_operation_logs: :environment do
+    bar = RakeProgressbar.new(DossierOperationLog.count)
+
+    DossierOperationLog.find_each do |log|
+      if log.dossier.blank?
+        log.destroy
+      end
+      bar.inc
+    end
+
+    bar.finished
+
+    AfterParty::TaskRecord.create version: '20181128155650'
+  end
+end