diff --git a/sapl/legacy/migration.py b/sapl/legacy/migration.py
index 8f56f91f1..fc22cf6d4 100644
--- a/sapl/legacy/migration.py
+++ b/sapl/legacy/migration.py
@@ -661,6 +661,8 @@ def adjust_documentoadministrativo(new, old):
 
 
 def adjust_mandato(new, old):
+    if old.dat_fim_mandato:
+        new.data_fim_mandato = old.dat_fim_mandato
     if not new.data_fim_mandato:
         legislatura = Legislatura.objects.latest('data_fim')
         new.data_fim_mandato = legislatura.data_fim