diff --git a/renter/price_tracker.go b/renter/price_tracker.go
index cb1b4c2..44c3e73 100644
--- a/renter/price_tracker.go
+++ b/renter/price_tracker.go
@@ -151,9 +151,9 @@ SELECT AVG(rate) as average_rate FROM (
 		return err
 	}
 
-	maxRPCPrice, ok := new(big.Rat).SetString(p.config.Config().Core.Storage.Sia.MaxRPCSCPrice)
-	if !ok {
-		return errors.New("failed to parse max rpc price")
+	maxRPCPrice, err := newRat(p.config.Config().Core.Storage.Sia.MaxRPCSCPrice, "max rpc price")
+	if err != nil {
+		return err
 	}
 
 	maxRPCPrice = ratDivide(maxRPCPrice, 1_000_000)