diff --git a/core/libs/tests/GuestKqueue.cpp b/core/libs/tests/GuestKqueue.cpp
index c3061a2c63..aecb4a9885 100644
--- a/core/libs/tests/GuestKqueue.cpp
+++ b/core/libs/tests/GuestKqueue.cpp
@@ -9,6 +9,7 @@
 #include <stdexcept>
 #include <string>
 #include <thread>
+#include <vector>
 #ifdef _WIN32
 #include <aclapi.h>
 #include <windows.h>
@@ -539,9 +540,14 @@ static std::string Utf8(const std::wstring& text) {
 }
 
 static PACL DenyListing(const std::wstring& directory, PSECURITY_DESCRIPTOR& owner) {
-    wchar_t account[256]{};
-    DWORD count = static_cast<DWORD>(sizeof(account) / sizeof(account[0]));
-    Require(::GetUserNameW(account, &count) != FALSE);
+    HANDLE token = nullptr;
+    Require(::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token) != FALSE);
+    DWORD size = 0;
+    ::GetTokenInformation(token, TokenUser, nullptr, 0, &size);
+    std::vector<unsigned char> user(size);
+    const BOOL queried = ::GetTokenInformation(token, TokenUser, user.data(), size, &size);
+    ::CloseHandle(token);
+    Require(queried != FALSE);
     PACL original = nullptr;
     Require(::GetNamedSecurityInfoW(directory.c_str(), SE_FILE_OBJECT, DACL_SECURITY_INFORMATION,
         nullptr, nullptr, &original, nullptr, &owner) == ERROR_SUCCESS);
@@ -549,9 +555,9 @@ static PACL DenyListing(const std::wstring& directory, PSECURITY_DESCRIPTOR& own
     denied.grfAccessPermissions = FILE_LIST_DIRECTORY;
     denied.grfAccessMode = DENY_ACCESS;
     denied.grfInheritance = NO_INHERITANCE;
-    denied.Trustee.TrusteeForm = TRUSTEE_IS_NAME;
+    denied.Trustee.TrusteeForm = TRUSTEE_IS_SID;
     denied.Trustee.TrusteeType = TRUSTEE_IS_USER;
-    denied.Trustee.ptstrName = account;
+    denied.Trustee.ptstrName = static_cast<LPWSTR>(reinterpret_cast<TOKEN_USER*>(user.data())->User.Sid);
     PACL blocked = nullptr;
     Require(::SetEntriesInAclW(1, &denied, original, &blocked) == ERROR_SUCCESS);
     const DWORD applied = ::SetNamedSecurityInfoW(const_cast<LPWSTR>(directory.c_str()), SE_FILE_OBJECT,