diff --git a/TramsDataApi/Startup.cs b/TramsDataApi/Startup.cs
index 6d6de9b1c..f555d700a 100644
--- a/TramsDataApi/Startup.cs
+++ b/TramsDataApi/Startup.cs
@@ -1,3 +1,4 @@
+using System.Text.Json.Serialization;
 using Dfe.Academisation.CorrelationIdMiddleware;
 
 namespace TramsDataApi
@@ -36,7 +37,7 @@ public Startup(IConfiguration configuration)
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
-            services.AddControllers();
+            services.AddControllers().AddJsonOptions(c => {c.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());});
             services.AddApiVersioning();
             services.AddFeatureManagement();