diff --git a/SabreTools.Library/Tools/OptimizedCRC.cs b/SabreTools.Library/External/OptimizedCRC.cs
similarity index 99%
rename from SabreTools.Library/Tools/OptimizedCRC.cs
rename to SabreTools.Library/External/OptimizedCRC.cs
index 7584fb08..6d533d65 100644
--- a/SabreTools.Library/Tools/OptimizedCRC.cs
+++ b/SabreTools.Library/External/OptimizedCRC.cs
@@ -24,7 +24,7 @@
 
 using System;
 
-namespace SabreTools.Library.Tools
+namespace SabreTools.Library.External
 {
     public class OptimizedCRC : IDisposable
     {
diff --git a/SabreTools.Library/Tools/Hasher.cs b/SabreTools.Library/Tools/Hasher.cs
index c51bf510..e666530e 100644
--- a/SabreTools.Library/Tools/Hasher.cs
+++ b/SabreTools.Library/Tools/Hasher.cs
@@ -4,6 +4,7 @@ using System.Security.Cryptography;
 using System.Threading.Tasks;
 
 using SabreTools.Library.DatFiles;
+using SabreTools.Library.External;
 
 namespace SabreTools.Library.Tools
 {