diff --git a/services/directory/src/FilterLists.Directory.Api/Startup.cs b/services/directory/src/FilterLists.Directory.Api/Startup.cs
index bf5765bb8..a233757e4 100644
--- a/services/directory/src/FilterLists.Directory.Api/Startup.cs
+++ b/services/directory/src/FilterLists.Directory.Api/Startup.cs
@@ -18,7 +18,8 @@ public Startup(IConfiguration configuration)
 
         public void ConfigureServices(IServiceCollection services)
         {
-            services.AddControllers();
+            services.AddControllers()
+                .AddJsonOptions(o => o.JsonSerializerOptions.IgnoreNullValues = true);
             services.AddApplicationServices(Configuration);
         }