diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
index 06af6df..d627f2d 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
@@ -33,6 +33,12 @@ var builder = WebApplication.CreateBuilder(args);
 // regardless of ASPNETCORE_ENVIRONMENT.
 builder.WebHost.UseStaticWebAssets();
 
+// Windows Service support: when the EXE is started by Service Control Manager (sc.exe),
+// the host needs to call SetServiceStatus to keep the SCM happy. UseWindowsService()
+// installs the WindowsServiceLifetime IFF WindowsServiceHelpers.IsWindowsService() is
+// true at runtime — so it's safely a no-op when running as a console app or on Linux.
+builder.Host.UseWindowsService(options => options.ServiceName = "OtOpcUaHost");
+
 // Per-role appsettings overlay: appsettings.{role}.json (single role) or appsettings.admin-driver.json
 // (both). Optional — base appsettings.json carries enough to boot if these don't exist.
 var roleSuffix = roles.Length == 0 ? null : string.Join('-', roles.OrderBy(r => r, StringComparer.Ordinal));
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Host/ZB.MOM.WW.OtOpcUa.Host.csproj b/src/Server/ZB.MOM.WW.OtOpcUa.Host/ZB.MOM.WW.OtOpcUa.Host.csproj
index 3b7e33b..bee4115 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Host/ZB.MOM.WW.OtOpcUa.Host.csproj
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Host/ZB.MOM.WW.OtOpcUa.Host.csproj
@@ -16,7 +16,11 @@
     <ItemGroup>
         <PackageReference Include="Akka.Hosting"/>
         <PackageReference Include="Serilog.AspNetCore"/>
-        <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Condition="$([MSBuild]::IsOSPlatform('Windows'))"/>
+        <!-- Always referenced (drops earlier IsOSPlatform condition) so Program.cs can
+             call builder.Host.UseWindowsService() unconditionally; the runtime helper
+             only activates when actually running as a Windows Service, so this is a
+             no-op on macOS/Linux. -->
+        <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices"/>
         <PackageReference Include="Microsoft.EntityFrameworkCore.Design">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>