diff --git a/tdutils/td/utils/port/path.h b/tdutils/td/utils/port/path.h
index 47b7d3a3..727ee173 100644
--- a/tdutils/td/utils/port/path.h
+++ b/tdutils/td/utils/port/path.h
@@ -212,11 +212,12 @@ Status walk_path_dir(const std::wstring &dir_name, Func &&func) {
 
 template <class Func>
 Status walk_path(CSlice path, Func &&func) {
+  TRY_RESULT(wpath, to_wstring(path));
   Slice path_slice = path;
   while (!path_slice.empty() && (path_slice.back() == '/' || path_slice.back() == '\\')) {
     path_slice.remove_suffix(1);
+    wpath.pop_back();
   }
-  TRY_RESULT(wpath, to_wstring(path_slice));
   return detail::walk_path_dir(wpath.c_str(), func);
 }
 
diff --git a/tdutils/td/utils/port/wstring_convert.cpp b/tdutils/td/utils/port/wstring_convert.cpp
index 56da62b9..8dd83cc7 100644
--- a/tdutils/td/utils/port/wstring_convert.cpp
+++ b/tdutils/td/utils/port/wstring_convert.cpp
@@ -31,7 +31,7 @@ class UsableFacet : public Facet {
 };
 }  // namespace detail
 
-Result<std::wstring> to_wstring(Slice slice) {
+Result<std::wstring> to_wstring(CSlice slice) {
   // TODO(perf): optimize
   std::wstring_convert<detail::UsableFacet<std::codecvt_utf8_utf16<wchar_t>>> converter;
   auto res = converter.from_bytes(slice.begin(), slice.end());
diff --git a/tdutils/td/utils/port/wstring_convert.h b/tdutils/td/utils/port/wstring_convert.h
index a795d2bd..5d6ed69d 100644
--- a/tdutils/td/utils/port/wstring_convert.h
+++ b/tdutils/td/utils/port/wstring_convert.h
@@ -18,7 +18,7 @@
 
 namespace td {
 
-Result<std::wstring> to_wstring(Slice slice);
+Result<std::wstring> to_wstring(CSlice slice);
 
 Result<string> from_wstring(const std::wstring &str);