diff --git a/src/Tgstation.Server.Host/Components/Session/ISessionControllerFactory.cs b/src/Tgstation.Server.Host/Components/Session/ISessionControllerFactory.cs
index 34f58c8cc0..c6d1a634ff 100644
--- a/src/Tgstation.Server.Host/Components/Session/ISessionControllerFactory.cs
+++ b/src/Tgstation.Server.Host/Components/Session/ISessionControllerFactory.cs
@@ -5,8 +5,6 @@ using Tgstation.Server.Api.Models.Internal;
 using Tgstation.Server.Host.Components.Deployment;
 using Tgstation.Server.Host.Components.Engine;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Components.Session
 {
 	/// <summary>
@@ -18,14 +16,14 @@ namespace Tgstation.Server.Host.Components.Session
 		/// Create a <see cref="ISessionController"/> from a freshly launch DreamDaemon instance.
 		/// </summary>
 		/// <param name="dmbProvider">The <see cref="IDmbProvider"/> to use.</param>
-		/// <param name="currentByondLock">The current <see cref="IEngineExecutableLock"/> if any.</param>
+		/// <param name="currentByondLock">The current <see cref="IEngineExecutableLock"/>. if any.</param>
 		/// <param name="launchParameters">The <see cref="DreamDaemonLaunchParameters"/> to use. <see cref="DreamDaemonLaunchParameters.SecurityLevel"/> will be updated with the minumum required security level for the launch.</param>
 		/// <param name="apiValidate">If the <see cref="ISessionController"/> should only validate the DMAPI then exit.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in a new <see cref="ISessionController"/>.</returns>
 		ValueTask<ISessionController> LaunchNew(
 			IDmbProvider dmbProvider,
-			IEngineExecutableLock currentByondLock,
+			IEngineExecutableLock? currentByondLock,
 			DreamDaemonLaunchParameters launchParameters,
 			bool apiValidate,
 			CancellationToken cancellationToken);