diff --git a/lib/tasks/2018_02_20_set_processed_at.rake b/lib/tasks/2018_02_20_set_processed_at.rake
new file mode 100644
index 000000000..2282e7f94
--- /dev/null
+++ b/lib/tasks/2018_02_20_set_processed_at.rake
@@ -0,0 +1,7 @@
+namespace :'2018_02_20_set_processed_at' do
+  task set: :environment do
+    Dossier.where(state: :accepte, processed_at: nil).find_each do |dossier|
+      dossier.update_column(:processed_at, dossier.en_instruction_at)
+    end
+  end
+end