diff --git a/rma_account/models/account_move.py b/rma_account/models/account_move.py
index 4ce2146d..c83529dc 100644
--- a/rma_account/models/account_move.py
+++ b/rma_account/models/account_move.py
@@ -238,6 +238,7 @@ class AccountMoveLine(models.Model):
         comodel_name="rma.order.line",
         string="RMA line",
         ondelete="set null",
+        index=True,
         help="This will contain the rma line that originated this line",
     )