diff --git a/omodscan/controls/connectioncombobox.cpp b/omodscan/controls/connectioncombobox.cpp
index 1ad77cc..50e3d0a 100644
--- a/omodscan/controls/connectioncombobox.cpp
+++ b/omodscan/controls/connectioncombobox.cpp
@@ -1,5 +1,5 @@
 #include <algorithm>
-#include <QSerialPortInfo>
+#include "serialportutils.h"
 #include "connectioncombobox.h"
 
 ///
@@ -21,11 +21,10 @@ ConnectionComboBox::ConnectionComboBox(QWidget* parent)
 {
     addItem(tr("Remote TCP/IP Server"), ConnectionType::Tcp, QString());
 
-    QStringList ports;
-    for(auto&& port: QSerialPortInfo::availablePorts())
+    for(auto&& port: getAvailableSerialPorts())
     {
-        const auto text = QString(tr("Direct Connection to %1")).arg(port.portName());
-        addItem(text, ConnectionType::Serial, port.portName());
+        const auto text = QString(tr("Direct Connection to %1")).arg(port);
+        addItem(text, ConnectionType::Serial, port);
     }
 }
 
diff --git a/omodscan/controls/numericlineedit.cpp b/omodscan/controls/numericlineedit.cpp
index d6b04c3..42737ed 100644
--- a/omodscan/controls/numericlineedit.cpp
+++ b/omodscan/controls/numericlineedit.cpp
@@ -441,7 +441,7 @@ void NumericLineEdit::on_rangeChanged(const QVariant& bottom, const QVariant& to
         {
             const int nums = QString::number(top.toInt()).length();
             _paddingZeroWidth = qMax(1, nums);
-            setMaxLength(qMax(1, nums));
+            setMaxLength(qMax(2, nums + 1));
             setValidator(new QIntValidator(bottom.toInt(), top.toInt(), this));
 
         }
@@ -475,7 +475,7 @@ void NumericLineEdit::on_rangeChanged(const QVariant& bottom, const QVariant& to
         {
             const int nums = QString::number(top.toLongLong()).length();
             _paddingZeroWidth = qMax(1, nums);
-            setMaxLength(qMax(1, nums));
+            setMaxLength(qMax(2, nums + 1));
             setValidator(new QInt64Validator(bottom.toLongLong(), top.toLongLong(), this));
         }
         break;
diff --git a/omodscan/dialogs/dialogmodbusscanner.cpp b/omodscan/dialogs/dialogmodbusscanner.cpp
index 933e619..e73116e 100644
--- a/omodscan/dialogs/dialogmodbusscanner.cpp
+++ b/omodscan/dialogs/dialogmodbusscanner.cpp
@@ -5,6 +5,7 @@
 #include <QNetworkInterface>
 #include <QAbstractEventDispatcher>
 #include "modbuslimits.h"
+#include "serialportutils.h"
 #include "modbusrtuscanner.h"
 #include "modbustcpscanner.h"
 #include "dialogmodbusscanner.h"
@@ -58,8 +59,7 @@ DialogModbusScanner::DialogModbusScanner(QWidget *parent)
     ui->pushButtonScan->setIcon(_iconStart);
 
     ui->radioButtonTCP->click();
-    for(auto&& port: QSerialPortInfo::availablePorts())
-        ui->comboBoxSerial->addItem(port.portName());
+    ui->comboBoxSerial->addItems(getAvailableSerialPorts());
 
     QHostAddress address, mask;
     for(auto&& eth : QNetworkInterface::allInterfaces()) {
diff --git a/omodscan/omodscan.pro b/omodscan/omodscan.pro
index 93f1757..4eb8b7f 100644
--- a/omodscan/omodscan.pro
+++ b/omodscan/omodscan.pro
@@ -4,7 +4,7 @@ CONFIG += c++17
 CONFIG -= debug_and_release
 CONFIG -= debug_and_release_target
 
-VERSION = 1.8.0
+VERSION = 1.8.1
 
 QMAKE_TARGET_PRODUCT = "Open ModScan"
 QMAKE_TARGET_DESCRIPTION = "An Open Source Modbus Master (Client) Utility"
@@ -176,6 +176,7 @@ HEADERS += \
     qrange.h \
     quintvalidator.h \
     recentfileactionlist.h \
+    serialportutils.h \
     windowactionlist.h
 
 FORMS += \
diff --git a/omodscan/serialportutils.h b/omodscan/serialportutils.h
new file mode 100644
index 0000000..96c52b5
--- /dev/null
+++ b/omodscan/serialportutils.h
@@ -0,0 +1,26 @@
+#ifndef SERIALPORTUTILS_H
+#define SERIALPORTUTILS_H
+
+#include <QSerialPortInfo>
+#include <QRegularExpression>
+
+///
+/// \brief getAvailableSerialPorts
+/// \return
+///
+inline QStringList getAvailableSerialPorts()
+{
+    QStringList ports;
+    for(auto&& port: QSerialPortInfo::availablePorts())
+        ports << port.portName();
+
+    static QRegularExpression re( "[^\\d]");
+    std::sort(ports.begin(), ports.end(), [](QString p1, QString p2)
+              {
+                  return p1.remove(re).toInt() < p2.remove(re).toInt();
+              });
+
+    return ports;
+}
+
+#endif // SERIALPORTUTILS_H