diff --git a/build.cake b/build.cake
index 49ae906c..322a1ed0 100644
--- a/build.cake
+++ b/build.cake
@@ -11,6 +11,15 @@ var version = "version";
 var repoDir = "repoDir";
 var outputPath = "outputPath";
 
+// Extension
+
+static ProcessArgumentBuilder AppendIf(this ProcessArgumentBuilder builder, string text, bool condition)
+{
+    return condition ? builder.Append(text) : builder;
+}
+
+// Properties
+
 string solution
 {
     get => System.IO.Path.Combine(repoDir, "src", "Snap.Hutao", "Snap.Hutao.sln");
@@ -157,6 +166,7 @@ Task("Build binary package")
                                             .Append("/p:AppxPackageSigningEnabled=false")
                                             .Append("/p:AppxBundle=Never")
                                             .Append("/p:AppxPackageOutput=" + outputPath)
+                                            .AppendIf("/p:AlphaConstants=IS_ALPHA_BUILD", !AppVeyor.IsRunningOnAppVeyor)
     };
 
     DotNetBuild(project, settings);
diff --git a/src/Snap.Hutao/Snap.Hutao/Snap.Hutao.csproj b/src/Snap.Hutao/Snap.Hutao/Snap.Hutao.csproj
index 84381f53..55739408 100644
--- a/src/Snap.Hutao/Snap.Hutao/Snap.Hutao.csproj
+++ b/src/Snap.Hutao/Snap.Hutao/Snap.Hutao.csproj
@@ -25,7 +25,7 @@
     <AppxBundle>Never</AppxBundle>
     <HoursBetweenUpdateChecks>0</HoursBetweenUpdateChecks>
     <StartupObject>Snap.Hutao.Program</StartupObject>
-    <DefineConstants>$(DefineConstants);DISABLE_XAML_GENERATED_MAIN;DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION;DISABLE_XAML_GENERATED_BINDING_DEBUG_OUTPUT</DefineConstants>
+    <DefineConstants>$(DefineConstants);DISABLE_XAML_GENERATED_MAIN;DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION;DISABLE_XAML_GENERATED_BINDING_DEBUG_OUTPUT;$(AlphaConstants)</DefineConstants>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <DebugSymbols>true</DebugSymbols>
     <DebugType>embedded</DebugType>