diff --git a/Nodsoft.WowsReplaysUnpack/Services/ReplayUnpackerService.cs b/Nodsoft.WowsReplaysUnpack/Services/ReplayUnpackerService.cs
index 7e2f73a..d8f5ba6 100644
--- a/Nodsoft.WowsReplaysUnpack/Services/ReplayUnpackerService.cs
+++ b/Nodsoft.WowsReplaysUnpack/Services/ReplayUnpackerService.cs
@@ -8,6 +8,7 @@
 using System.IO.Compression;
 using System.Text;
 using System.Text.Json;
+using System.Threading;
 
 namespace Nodsoft.WowsReplaysUnpack.Services;
 
@@ -21,6 +22,7 @@ public sealed class ReplayUnpackerService<TController> : ReplayUnpackerService,
 	private readonly JsonSerializerOptions _jsonSerializerOptions = new() { PropertyNameCaseInsensitive = true };
 	private readonly IReplayDataParser _replayDataParser;
 	private readonly IReplayController _replayController;
+	private static readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1);
 
 	public ReplayUnpackerService(IReplayDataParser replayDataParser, TController replayController)
 	{
@@ -69,7 +71,7 @@ Seek to offset 4 in the replay file (skipping the magic number)
 		See http://wiki.vbaddict.net/pages/File_Replays for more details.
 		*/
 		options ??= new();
-
+		_semaphore.Wait();
 		BinaryReader binaryReader = new(stream);
 
 		byte[] signature = binaryReader.ReadBytes(4);
@@ -103,7 +105,7 @@ Seek to offset 4 in the replay file (skipping the magic number)
 		{
 			_replayController.HandleNetworkPacket(networkPacket, options);
 		}
-
+		_semaphore.Release();
 		return replay;
 	}