diff --git a/angelscript/source/as_criticalsection.h b/angelscript/source/as_criticalsection.h
index b05c224..ac84319 100644
--- a/angelscript/source/as_criticalsection.h
+++ b/angelscript/source/as_criticalsection.h
@@ -198,7 +198,7 @@ public:
     bool TryEnter();
 
 protected:
-    std::unique_ptr<std::mutex> _mutex;
+    std::mutex _mutex;
 };
 
 class asCThreadReadWriteLock
@@ -215,7 +215,7 @@ public:
     void ReleaseShared();
     bool TryAcquireShared();
 protected:
-    std::unique_ptr<std::shared_mutex> _mutex;
+    std::shared_mutex _mutex;
 };
 
 #endif
diff --git a/angelscript/source/as_thread.cpp b/angelscript/source/as_thread.cpp
index 83f7e22..6dd3cca 100644
--- a/angelscript/source/as_thread.cpp
+++ b/angelscript/source/as_thread.cpp
@@ -349,8 +349,6 @@ asCThreadCriticalSection::asCThreadCriticalSection()
 	// MinGW also only defines this version
 	InitializeCriticalSection(&cs);
 #endif
-#elif defined AS_STD_THREADS
-    _mutex = std::make_unique<std::mutex>();
 #endif
 }
 
@@ -370,7 +368,7 @@ void asCThreadCriticalSection::Enter()
 #elif defined AS_WINDOWS_THREADS
 	EnterCriticalSection(&cs);
 #elif defined(AS_STD_THREADS)
-    _mutex->lock();
+    _mutex.lock();
 #endif
 }
 
@@ -381,7 +379,7 @@ void asCThreadCriticalSection::Leave()
 #elif defined AS_WINDOWS_THREADS
 	LeaveCriticalSection(&cs);
 #elif defined(AS_STD_THREADS)
-    _mutex->unlock();
+    _mutex.unlock();
 #endif
 }
 
@@ -392,7 +390,7 @@ bool asCThreadCriticalSection::TryEnter()
 #elif defined AS_WINDOWS_THREADS
 	return TryEnterCriticalSection(&cs) ? true : false;
 #elif defined(AS_STD_THREADS)
-    return _mutex->try_lock();
+    return _mutex.try_lock();
 #else
 	return true;
 #endif
@@ -416,8 +414,6 @@ asCThreadReadWriteLock::asCThreadReadWriteLock()
 	readLocks = CreateSemaphoreW(NULL, maxReaders, maxReaders, 0);
 	InitializeCriticalSection(&writeLock);
 #endif
-#elif defined AS_STD_THREADS
-    _mutex = std::make_unique<std::shared_mutex>();
 #endif
 }
 
@@ -450,7 +446,7 @@ void asCThreadReadWriteLock::AcquireExclusive()
 	// lock the readers when this writer releases them anyway.
 	LeaveCriticalSection(&writeLock);
 #elif defined(AS_STD_THREADS)
-    _mutex->lock();
+    _mutex.lock();
 #endif
 }
 
@@ -462,7 +458,7 @@ void asCThreadReadWriteLock::ReleaseExclusive()
 	// Release all readers at once
 	ReleaseSemaphore(readLocks, maxReaders, 0);
 #elif defined(AS_STD_THREADS)
-    _mutex->unlock();
+    _mutex.unlock();
 #endif
 }
 
@@ -474,7 +470,7 @@ void asCThreadReadWriteLock::AcquireShared()
 	// Lock a reader slot
 	WaitForSingleObjectEx(readLocks, INFINITE, FALSE);
 #elif defined(AS_STD_THREADS)
-    _mutex->lock_shared();
+    _mutex.lock_shared();
 #endif
 }
 
@@ -486,7 +482,7 @@ void asCThreadReadWriteLock::ReleaseShared()
 	// Release the reader slot
 	ReleaseSemaphore(readLocks, 1, 0);
 #elif defined(AS_STD_THREADS)
-    _mutex->unlock_shared();
+    _mutex.unlock_shared();
 #endif
 }