diff --git a/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj b/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
index abfdcdb..82e241b 100644
--- a/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
+++ b/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
@@ -222,7 +222,9 @@
       <SubType>Designer</SubType>
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
-    <None Include="app.config" />
+    <None Include="app.config">
+      <SubType>Designer</SubType>
+    </None>
     <None Include="Ascertia_CodeSigning_Free_180319.pfx" />
     <None Include="OutlookSwissPTTimetable_TemporaryKey.pfx" />
     <None Include="packages.config" />
diff --git a/OutlookSwissPTTimetable/Properties/Settings.Designer.cs b/OutlookSwissPTTimetable/Properties/Settings.Designer.cs
index 69affd6..0d45e7f 100644
--- a/OutlookSwissPTTimetable/Properties/Settings.Designer.cs
+++ b/OutlookSwissPTTimetable/Properties/Settings.Designer.cs
@@ -50,9 +50,9 @@ public ushort BusyStatus {
         [global::System.Configuration.UserScopedSettingAttribute()]
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
         [global::System.Configuration.DefaultSettingValueAttribute("5")]
-        public string LookaheadLookbackMinutes {
+        public ushort LookaheadLookbackMinutes {
             get {
-                return ((string)(this["LookaheadLookbackMinutes"]));
+                return ((ushort)(this["LookaheadLookbackMinutes"]));
             }
             set {
                 this["LookaheadLookbackMinutes"] = value;
diff --git a/OutlookSwissPTTimetable/Properties/Settings.settings b/OutlookSwissPTTimetable/Properties/Settings.settings
index f3f6fd5..ce4fbc2 100644
--- a/OutlookSwissPTTimetable/Properties/Settings.settings
+++ b/OutlookSwissPTTimetable/Properties/Settings.settings
@@ -8,7 +8,7 @@
     <Setting Name="BusyStatus" Type="System.UInt16" Scope="User">
       <Value Profile="(Default)">2</Value>
     </Setting>
-    <Setting Name="LookaheadLookbackMinutes" Type="System.String" Scope="User">
+    <Setting Name="LookaheadLookbackMinutes" Type="System.UInt16" Scope="User">
       <Value Profile="(Default)">5</Value>
     </Setting>
   </Settings>