diff --git a/DerpingDrivers/DerpingDrivers.csproj b/DerpingDrivers/DerpingDrivers.csproj
index a5403c2..69311c4 100644
--- a/DerpingDrivers/DerpingDrivers.csproj
+++ b/DerpingDrivers/DerpingDrivers.csproj
@@ -113,6 +113,7 @@
     <Compile Include="Util\BcdHelper.cs" />
     <Compile Include="Util\CodeIntegrityHelper.cs" />
     <Compile Include="Util\CodeIntegrityPolicyHelper.cs" />
+    <Compile Include="Util\InverseBooleanConverter.cs" />
     <Compile Include="Util\OsUpgradeDetection.cs" />
     <Compile Include="Util\OSVersionInfo.cs" />
     <Compile Include="Util\UEFIHelper.cs" />
diff --git a/DerpingDrivers/MainWindow.xaml b/DerpingDrivers/MainWindow.xaml
index af68f01..88cc331 100644
--- a/DerpingDrivers/MainWindow.xaml
+++ b/DerpingDrivers/MainWindow.xaml
@@ -3,7 +3,7 @@
                       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                       xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-                      xmlns:local="clr-namespace:DerpingDrivers"
+                      xmlns:util="clr-namespace:DerpingDrivers.Util"
                       xmlns:controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
                       xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
                       mc:Ignorable="d"
@@ -15,6 +15,9 @@
                       BorderThickness="0"
                       GlowBrush="{DynamicResource AccentColorBrush}"
                       DataContext="{Binding RelativeSource={RelativeSource Self}}">
+    <controls:MetroWindow.Resources>
+        <util:InverseBooleanConverter x:Key="InverseBooleanConverter"/>
+    </controls:MetroWindow.Resources>
 
     <TabControl Margin="15">
 
@@ -100,7 +103,8 @@
                                            Header="Allow Prerelease Signatures"
                                            OnLabel="TESTSINGING is on"
                                            OffLabel="TESTSINGING is off"
-                                           IsChecked="{Binding Path=AllowPrereleaseSignatures}" />
+                                           IsChecked="{Binding Path=AllowPrereleaseSignatures}"
+                                           IsEnabled="{Binding Path=IsSecureBootEnabled, Converter={StaticResource InverseBooleanConverter}}"/>
 
                     <TextBlock Grid.Row="0" Grid.Column="1"
                                Margin="10,0,0,0"
@@ -119,7 +123,7 @@
                                            OffLabel="Only WHQL-signed drivers allowed"
                                            IsEnabled="{Binding Path=IsWindows10}"
                                            IsChecked="{Binding Path=WhqlDeveloperTestMode}" />
-                    
+
                     <TextBlock Grid.Row="1" Grid.Column="1"
                                Margin="10,20,0,0"
                                TextWrapping="Wrap" 
diff --git a/DerpingDrivers/MainWindow.xaml.cs b/DerpingDrivers/MainWindow.xaml.cs
index 778f99c..fee1278 100644
--- a/DerpingDrivers/MainWindow.xaml.cs
+++ b/DerpingDrivers/MainWindow.xaml.cs
@@ -57,7 +57,17 @@ namespace DerpingDrivers
         /// <summary>
         ///     Gets test-mode status.
         /// </summary>
-        public string TestSigningStatus => CodeIntegrityHelper.IsTestSignEnabled ? "Enabled" : "Disabled";
+        public string TestSigningStatus => UefiHelper.IsRunningInUefiMode && UefiHelper.IsSecureBootEnabled
+            ?
+            "Not available"
+            : CodeIntegrityHelper.IsTestSignEnabled
+                ? "Enabled"
+                : "Disabled";
+
+        /// <summary>
+        ///     True if SecureBoot enabled, false otherwise.
+        /// </summary>
+        public bool IsSecureBootEnabled => UefiHelper.IsRunningInUefiMode && UefiHelper.IsSecureBootEnabled;
 
         /// <summary>
         ///     Gets or sets whether prerelease signatures (a.k.a. TESTSIGNING) are accepted by the kernel.
diff --git a/DerpingDrivers/Util/InverseBooleanConverter.cs b/DerpingDrivers/Util/InverseBooleanConverter.cs
new file mode 100644
index 0000000..c203669
--- /dev/null
+++ b/DerpingDrivers/Util/InverseBooleanConverter.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace DerpingDrivers.Util
+{
+    [ValueConversion(typeof(bool), typeof(bool))]
+    public class InverseBooleanConverter : IValueConverter
+    {
+        #region IValueConverter Members
+
+        public object Convert(object value, Type targetType, object parameter,
+            CultureInfo culture)
+        {
+            if (targetType != typeof(bool))
+                throw new InvalidOperationException("The target must be a boolean");
+
+            return !(bool) value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter,
+            CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+
+        #endregion
+    }
+}
\ No newline at end of file