diff --git a/tdutils/td/utils/port/Clocks.cpp b/tdutils/td/utils/port/Clocks.cpp
index 4d80568df..169f77a8d 100644
--- a/tdutils/td/utils/port/Clocks.cpp
+++ b/tdutils/td/utils/port/Clocks.cpp
@@ -10,12 +10,13 @@
 
 namespace td {
 
-ClocksDefault::Duration ClocksDefault::monotonic() {
+double Clocks::monotonic() {
+  // TODO write system specific functions, because std::chrono::steady_clock is steady only under Windows
   auto duration = std::chrono::steady_clock::now().time_since_epoch();
   return static_cast<double>(std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count()) * 1e-9;
 }
 
-ClocksDefault::Duration ClocksDefault::system() {
+double Clocks::system() {
   auto duration = std::chrono::system_clock::now().time_since_epoch();
   return static_cast<double>(std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count()) * 1e-9;
 }
diff --git a/tdutils/td/utils/port/Clocks.h b/tdutils/td/utils/port/Clocks.h
index 0ae04c203..f3effb831 100644
--- a/tdutils/td/utils/port/Clocks.h
+++ b/tdutils/td/utils/port/Clocks.h
@@ -8,21 +8,10 @@
 
 namespace td {
 
-class ClocksBase {
- public:
-  using Duration = double;
+struct Clocks {
+  static double monotonic();
+
+  static double system();
 };
 
-// TODO: (maybe) write system specific functions.
-class ClocksDefault {
- public:
-  using Duration = ClocksBase::Duration;
-
-  static Duration monotonic();
-
-  static Duration system();
-};
-
-using Clocks = ClocksDefault;
-
 }  // namespace td