diff --git a/ereader.go b/ereader.go
index 6d4665f..22582a9 100644
--- a/ereader.go
+++ b/ereader.go
@@ -696,7 +696,7 @@ func (o *OpenOrder) read(b *bufio.Reader) (err error) {
 	if o.Order.StockRangeUpper, err = readFloat(b); err != nil {
 		return err
 	}
-	if o.Order.DisplaySize, err = readInt(b); err != nil {
+	if o.Order.DisplaySize, err = readIntOrDefaultIfEmpty(b, 0); err != nil {
 		return err
 	}
 	if o.Order.BlockOrder, err = readBool(b); err != nil {
diff --git a/wire.go b/wire.go
index a73c0c3..e6784a7 100644
--- a/wire.go
+++ b/wire.go
@@ -47,12 +47,16 @@ func readStringList(b *bufio.Reader, sep string) (r []string, err error) {
 }
 
 func readInt(b *bufio.Reader) (int64, error) {
+	return readIntOrDefaultIfEmpty(b,  math.MaxInt64)
+}
+
+func readIntOrDefaultIfEmpty(b *bufio.Reader, defaultIfEmpty int64) (int64, error) {
 	str, err := readString(b)
 	if err != nil {
 		return -1, err
 	}
 	if str == "" {
-		return math.MaxInt64, nil
+		return defaultIfEmpty, nil
 	}
 	i, err := strconv.ParseInt(str, 10, 64)
 	return i, err