diff --git a/ts/client/src/client.ts b/ts/client/src/client.ts
index 8dbc123d8..8d6de578c 100644
--- a/ts/client/src/client.ts
+++ b/ts/client/src/client.ts
@@ -1178,17 +1178,14 @@ export class MangoClient {
 
     const limitPrice = serum3MarketExternal.priceNumberToLots(price);
     const maxBaseQuantity = serum3MarketExternal.baseSizeNumberToLots(size);
-    const maxQuoteQuantity = serum3MarketExternal.decoded.quoteLotSize
-      .mul(
-        new BN(
-          1 + group.getSerum3FeeRates(orderType === Serum3OrderType.postOnly),
-        ),
-      )
-      .mul(
-        serum3MarketExternal
-          .baseSizeNumberToLots(size)
-          .mul(serum3MarketExternal.priceNumberToLots(price)),
-      );
+    const maxQuoteQuantity = new BN(
+      serum3MarketExternal.decoded.quoteLotSize.toNumber() * 1 +
+        group.getSerum3FeeRates(orderType === Serum3OrderType.postOnly),
+    ).mul(
+      serum3MarketExternal
+        .baseSizeNumberToLots(size)
+        .mul(serum3MarketExternal.priceNumberToLots(price)),
+    );
     const payerTokenIndex = ((): TokenIndex => {
       if (side == Serum3Side.bid) {
         return serum3Market.quoteTokenIndex;