diff --git a/pkg/types/market.go b/pkg/types/market.go
index 99b2f9efb..6b7199798 100644
--- a/pkg/types/market.go
+++ b/pkg/types/market.go
@@ -70,6 +70,12 @@ func (m Market) TruncateQuantity(quantity fixedpoint.Value) fixedpoint.Value {
 	return fixedpoint.MustNewFromString(qs)
 }
 
+// RoundDownQuantityByPrecision uses the volume precision to round down the quantity
+// This is different from the TruncateQuantity, which uses StepSize (it uses fewer fractions to truncate)
+func (m Market) RoundDownQuantityByPrecision(quantity fixedpoint.Value) fixedpoint.Value {
+	return quantity.Round(m.VolumePrecision, fixedpoint.Down)
+}
+
 func (m Market) TruncatePrice(price fixedpoint.Value) fixedpoint.Value {
 	return fixedpoint.MustNewFromString(m.FormatPrice(price))
 }