diff --git a/tdutils/td/utils/FileLog.cpp b/tdutils/td/utils/FileLog.cpp
index 2cd0b63fc..9bb076979 100644
--- a/tdutils/td/utils/FileLog.cpp
+++ b/tdutils/td/utils/FileLog.cpp
@@ -31,8 +31,7 @@ bool FileLog::init(string path, int64 rotate_threshold) {
 
   fd_.close();
   fd_ = r_fd.move_as_ok();
-  // FIXME
-  //Fd::duplicate(fd_.get_fd(), Fd::Stderr()).ignore();
+  fd_.get_native_fd().duplicate(Stderr().get_native_fd()).ignore();
 
   path_ = std::move(path);
   size_ = fd_.get_size();
@@ -85,8 +84,7 @@ void FileLog::do_rotate() {
     process_fatal_error(r_fd.error().message());
   }
   fd_ = r_fd.move_as_ok();
-  // FIXME
-  //Fd::duplicate(fd_.get_fd(), Fd::Stderr()).ignore();
+  fd_.get_native_fd().duplicate(Stderr().get_native_fd()).ignore();
   size_ = 0;
   SET_VERBOSITY_LEVEL(current_verbosity_level);
 }
diff --git a/tdutils/td/utils/port/Fd.cpp b/tdutils/td/utils/port/Fd.cpp
index 4e4f32d27..4afd21203 100644
--- a/tdutils/td/utils/port/Fd.cpp
+++ b/tdutils/td/utils/port/Fd.cpp
@@ -8,19 +8,6 @@
 
 namespace td {
 
-#if TD_PORT_POSIX
-
-Status Fd::duplicate(const Fd &from, Fd &to) {
-  CHECK(!from.empty());
-  CHECK(!to.empty());
-  if (dup2(from.get_native_fd(), to.get_native_fd()) == -1) {
-    return OS_ERROR("Failed to duplicate file descriptor");
-  }
-  return Status::OK();
-}
-
-#endif
-
 #if TD_PORT_WINDOWS
 
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
@@ -60,10 +47,6 @@ Fd &Fd::Stdout() {
 }
 #endif
 
-Status Fd::duplicate(const Fd &from, Fd &to) {
-  return Status::Error("Not supported");
-}
-
 #endif
 
 }  // namespace td
diff --git a/tdutils/td/utils/port/Fd.h b/tdutils/td/utils/port/Fd.h
index 6700fa09e..78c0d7bd7 100644
--- a/tdutils/td/utils/port/Fd.h
+++ b/tdutils/td/utils/port/Fd.h
@@ -7,17 +7,4 @@
 #pragma once
 
 #if 0
-#include "td/utils/port/config.h"
-
-#include "td/utils/common.h"
-#include "td/utils/Status.h"
-
-namespace td {
-
-class Fd {
- public:
-  static Status duplicate(const Fd &from, Fd &to);
-};
-
-}  // namespace td
 #endif
diff --git a/tdutils/td/utils/port/detail/NativeFd.cpp b/tdutils/td/utils/port/detail/NativeFd.cpp
index 11421374f..21b540655 100644
--- a/tdutils/td/utils/port/detail/NativeFd.cpp
+++ b/tdutils/td/utils/port/detail/NativeFd.cpp
@@ -96,6 +96,19 @@ Status NativeFd::set_is_blocking_unsafe(bool is_blocking) const {
   return Status::OK();
 }
 
+Status NativeFd::duplicate(const NativeFd &to) const {
+#if TD_PORT_POSIX
+  CHECK(*this);
+  CHECK(to);
+  if (dup2(fd(), to.fd()) == -1) {
+    return OS_ERROR("Failed to duplicate file descriptor");
+  }
+  return Status::OK();
+#elif TD_PORT_WINDOWS
+  return Status::Error("Not supported");
+#endif
+}
+
 void NativeFd::close() {
   if (!*this) {
     return;
diff --git a/tdutils/td/utils/port/detail/NativeFd.h b/tdutils/td/utils/port/detail/NativeFd.h
index d01de1f5e..431db89b3 100644
--- a/tdutils/td/utils/port/detail/NativeFd.h
+++ b/tdutils/td/utils/port/detail/NativeFd.h
@@ -50,6 +50,8 @@ class NativeFd {
 
   Status set_is_blocking_unsafe(bool is_blocking) const;  // may drop other Fd flags on non-Windows
 
+  Status duplicate(const NativeFd &to) const;
+
   void close();
   Raw release();