diff --git a/src/Tgstation.Server.Host/Components/Interop/Topic/EventNotification.cs b/src/Tgstation.Server.Host/Components/Interop/Topic/EventNotification.cs
index 6977a27554..75eb3bc9f4 100644
--- a/src/Tgstation.Server.Host/Components/Interop/Topic/EventNotification.cs
+++ b/src/Tgstation.Server.Host/Components/Interop/Topic/EventNotification.cs
@@ -4,8 +4,6 @@ using System.Linq;
 
 using Tgstation.Server.Host.Components.Events;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Components.Interop.Topic
 {
 	/// <summary>
@@ -22,14 +20,14 @@ namespace Tgstation.Server.Host.Components.Interop.Topic
 		/// <summary>
 		/// The set of parameters.
 		/// </summary>
-		public IReadOnlyCollection<string> Parameters { get; }
+		public IReadOnlyCollection<string?> Parameters { get; }
 
 		/// <summary>
 		/// Initializes a new instance of the <see cref="EventNotification"/> class.
 		/// </summary>
 		/// <param name="eventType">The value of <see cref="Type"/>.</param>
 		/// <param name="parameters">The <see cref="IEnumerable{T}"/> that forms the value of <see cref="Parameters"/>.</param>
-		public EventNotification(EventType eventType, IEnumerable<string> parameters = null)
+		public EventNotification(EventType eventType, IEnumerable<string?> parameters)
 		{
 			Type = eventType;
 			Parameters = parameters?.ToList() ?? throw new ArgumentNullException(nameof(parameters));