diff --git a/src/sync.h b/src/sync.h
index ee189bee105..f863e5f5822 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -39,12 +39,6 @@ LOCK2(mutex1, mutex2);
 
 TRY_LOCK(mutex, name);
     std::unique_lock<std::recursive_mutex> name(mutex, std::try_to_lock_t);
-
-ENTER_CRITICAL_SECTION(mutex); // no RAII
-    mutex.lock();
-
-LEAVE_CRITICAL_SECTION(mutex); // no RAII
-    mutex.unlock();
  */
 
 ///////////////////////////////
@@ -270,20 +264,6 @@ inline MutexType* MaybeCheckNotHeld(MutexType* m) LOCKS_EXCLUDED(m) LOCK_RETURNE
 #define TRY_LOCK(cs, name) UniqueLock name(LOCK_ARGS(cs), true)
 #define WAIT_LOCK(cs, name) UniqueLock name(LOCK_ARGS(cs))
 
-#define ENTER_CRITICAL_SECTION(cs)                            \
-    {                                                         \
-        EnterCritical(#cs, __FILE__, __LINE__, &cs); \
-        (cs).lock();                                          \
-    }
-
-#define LEAVE_CRITICAL_SECTION(cs)                                          \
-    {                                                                       \
-        std::string lockname;                                               \
-        CheckLastCritical((void*)(&cs), lockname, #cs, __FILE__, __LINE__); \
-        (cs).unlock();                                                      \
-        LeaveCritical();                                                    \
-    }
-
 //! Run code while locking a mutex.
 //!
 //! Examples: