diff --git a/rattail/db/extension/model.py b/rattail/db/extension/model.py
index d659becb1ce8ba7411e3e72dcec267f9b512bac0..2fdcbfb258654281bcb4e0f4d015c133904c6ee2 100644
--- a/rattail/db/extension/model.py
+++ b/rattail/db/extension/model.py
@@ -714,11 +714,13 @@ Product.prices = relationship(
 Product.regular_price = relationship(
     ProductPrice,
     primaryjoin=Product.regular_price_uuid == ProductPrice.uuid,
+    lazy='joined',
     post_update=True)
 
 Product.current_price = relationship(
     ProductPrice,
     primaryjoin=Product.current_price_uuid == ProductPrice.uuid,
+    lazy='joined',
     post_update=True)