diff --git a/rules.go b/rules.go
index 997b939..4f27638 100644
--- a/rules.go
+++ b/rules.go
@@ -56,8 +56,8 @@ func resetMsgParsingRules() {
 						        ,(5000, ` + strconv.Itoa(objSubTypeMessageInventoryReq) + `, "Inventory request", "^/inv$")
 						        ,(5000, ` + strconv.Itoa(objSubTypeMessageTimeReq) + `, "Time request", "^/time$")
 						        ,(5000, ` + strconv.Itoa(objSubTypeMessagePledge) + `, "Pledge", "^/pledge$")
-						        ,(5000, ` + strconv.Itoa(objSubTypeMessageBuyReq) + `, "Buy request", "^/wtb_(?P<Item>[0-9]+)_(?P<Quantity>[0-9]+)$")
-						        ,(5000, ` + strconv.Itoa(objSubTypeMessageSellReq) + `, "Sell request", "^/wts_(?P<Item>[0-9]+)_(?P<Quantity>[0-9]+)(_(?P<Price>[0-9]+)){0,1}$")
+						        ,(5000, ` + strconv.Itoa(objSubTypeMessageBuyReq) + `, "Buy request", "^/wtb_(?P<Item>[0-9]+)(_(?P<Quantity>[0-9]+)){0,1}$")
+						        ,(5000, ` + strconv.Itoa(objSubTypeMessageSellReq) + `, "Sell request", "^/wts_(?P<Item>[0-9]+)(_(?P<Quantity>[0-9]+)(_(?P<Price>[0-9]+)){0,1}){0,1}$")
 						        ,(5000, ` + strconv.Itoa(objSubTypeMessageOrderbookReq) + `, "Orderbook request", "^/t_(?P<Item>[0-9]+)$")
 		;`)
 	failOnError(err, "resetMsgParsingRules : populate table msg_rules")