diff --git a/Tsi1.Api/Tsi1.Api/Startup.cs b/Tsi1.Api/Tsi1.Api/Startup.cs
index 369da763de4eb9e1b36021dafd89bb2e15651955..f6875a941d07522ec6b2f79f14cf0b1aaa06c443 100644
--- a/Tsi1.Api/Tsi1.Api/Startup.cs
+++ b/Tsi1.Api/Tsi1.Api/Startup.cs
@@ -93,6 +93,8 @@ namespace Tsi1.Api
             services.AddScoped<IDataLoad, DataLoad>();
             services.AddScoped<ISurveyService, SurveyService>();
 
+            services.AddSingleton<PresenceTracker>();
+
             services.Configure<MailSettings>(Configuration.GetSection("MailSettings"));
             services.AddScoped<IEmailService, EmailService>();