diff --git a/purchase.py b/purchase.py
index f3832da7a9..8bfab3175f 100644
--- a/purchase.py
+++ b/purchase.py
@@ -132,8 +132,8 @@ class PurchaseLine:
             return self.purchase.drop_location.id
         return result
 
-    def get_move(self):
-        move = super(PurchaseLine, self).get_move()
+    def get_move(self, move_type):
+        move = super(PurchaseLine, self).get_move(move_type)
         if move and self.purchase.customer:
             move.cost_price = move.unit_price
         return move