diff --git a/WindowsCredentialManager.Tests/WindowsCredentialManager.Tests.csproj b/WindowsCredentialManager.Tests/WindowsCredentialManager.Tests.csproj
index 4d31599..7ca9042 100644
--- a/WindowsCredentialManager.Tests/WindowsCredentialManager.Tests.csproj
+++ b/WindowsCredentialManager.Tests/WindowsCredentialManager.Tests.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFrameworks>netcoreapp3.1;net6</TargetFrameworks>
 	<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
diff --git a/WindowsCredentialManager/Win32/Types/CREDENTIALW.cs b/WindowsCredentialManager/Win32/Types/CREDENTIALW.cs
index 1ce7153..712ca82 100644
--- a/WindowsCredentialManager/Win32/Types/CREDENTIALW.cs
+++ b/WindowsCredentialManager/Win32/Types/CREDENTIALW.cs
@@ -1,3 +1,5 @@
+using System.Runtime.InteropServices.ComTypes;
+
 namespace WindowsCredentialManager.Win32.Types
 {
   using System;
@@ -10,7 +12,7 @@ internal struct CREDENTIALW
     public CREDENTIAL_TYPE Type;
     [MarshalAs (UnmanagedType.LPWStr)] public string TargetName;
     [MarshalAs (UnmanagedType.LPWStr)] public string? Comment;
-    public DateTimeOffset LastWritten;
+    public FILETIME LastWritten;
     public int BlobSize;
     public SecureBlob? Blob;
     public CREDENTIAL_PERSIST Persist;