diff --git a/std/runtime/atomic.jule b/std/runtime/atomic.jule
index 0bf83907..f122a447 100644
--- a/std/runtime/atomic.jule
+++ b/std/runtime/atomic.jule
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD 3-Clause
 // license that can be found in the LICENSE file.
 
-type atomicMemoryOrder = int
+type atomicMemoryOrder: int
 
 const atomicRelaxed = atomicMemoryOrder(0)
 const atomicConsume = atomicMemoryOrder(1)
diff --git a/std/sync/atomic/atomic.jule b/std/sync/atomic/atomic.jule
index 4ff7e572..ba031e02 100644
--- a/std/sync/atomic/atomic.jule
+++ b/std/sync/atomic/atomic.jule
@@ -4,39 +4,37 @@
 
 use "std/runtime"
 
-// Memory order for atomic operations.
-// Specifies how memory accesses.
-enum MemoryOrder {
-	// The weakest memory order.
-	// There no synchronization or ordering on read/write access.
-	// Only the operation is guaranteed to be atomic.
-	// Usually performs fastest atomicity performance.
-	Relaxed: runtime::atomicRelaxed,
-
-	// Combined with a load, if the loaded value was written
-	// by a store operation with a Release or stronger order,
-	// all subsequent operations are ordered after that store.
-	// Especially all subsequent uploads will see the data
-	// written before the repository.
-	Acquire: runtime::atomicAcquire,
-
-	// When combined with a store, all previous operations are
-	// ordered with the Acquire or stronger order before any load
-	// of that value. In particular, all previous writes become
-	// visible to all threads that perform an Acquire or stronger
-	// load of this value.
-	Release: runtime::atomicRelease,
-
-	// Acquire and Release combined.
-	// Aka acquire/release.
-	// For loads it uses Acquire, for stores it uses Release ordering.
-	AcqRel: runtime::atomicAcqRel,
-
-	// Default memory order for most things.
-	// Aka sequentially consistent.
-	// Operations are sequenced consistently.
-	SeqCst: runtime::atomicSeqCst,
-}
+type memoryOrder = runtime::atomicMemoryOrder
+
+// The weakest memory order.
+// There no synchronization or ordering on read/write access.
+// Only the operation is guaranteed to be atomic.
+// Usually performs fastest atomicity performance.
+const Relaxed = memoryOrder(runtime::atomicRelaxed)
+
+// Combined with a load, if the loaded value was written
+// by a store operation with a Release or stronger order,
+// all subsequent operations are ordered after that store.
+// Especially all subsequent uploads will see the data
+// written before the repository.
+const Acquire = memoryOrder(runtime::atomicAcquire)
+
+// When combined with a store, all previous operations are
+// ordered with the Acquire or stronger order before any load
+// of that value. In particular, all previous writes become
+// visible to all threads that perform an Acquire or stronger
+// load of this value.
+const Release = memoryOrder(runtime::atomicRelease)
+
+// Acquire and Release combined.
+// Aka acquire/release.
+// For loads it uses Acquire, for stores it uses Release ordering.
+const AcqRel = memoryOrder(runtime::atomicAcqRel)
+
+// Default memory order for most things.
+// Aka sequentially consistent.
+// Operations are sequenced consistently.
+const SeqCst = memoryOrder(runtime::atomicSeqCst)
 
 struct number[T] {
 	n: T
@@ -44,27 +42,27 @@ struct number[T] {
 
 impl number {
 	// Atomically stores new value and returns the previous value.
-	fn Swap(mut self, new: T, order: MemoryOrder): (old: T) {
+	fn Swap(mut self, new: T, order: memoryOrder): (old: T) {
 		ret unsafe { runtime::atomicSwap[T](&self.n, &new, order) }
 	}
 
 	// Executes the compare-and-swap operation.
-	fn CompareSwap(mut self, old: T, new: T, order: MemoryOrder): (swapped: bool) {
+	fn CompareSwap(mut self, old: T, new: T, order: memoryOrder): (swapped: bool) {
 		ret unsafe { runtime::atomicCompareSwap[T](&self.n, &old, &new, order, order) }
 	}
 
 	// Atomically adds delta to value and returns the previous value.
-	fn Add(mut self, delta: T, order: MemoryOrder): (old: T) {
+	fn Add(mut self, delta: T, order: memoryOrder): (old: T) {
 		ret unsafe { runtime::atomicAdd[T](&self.n, delta, order) }
 	}
 
 	// Atomically reads and returns value.
-	fn Load(self, order: MemoryOrder): T {
+	fn Load(self, order: memoryOrder): T {
 		ret unsafe { runtime::atomicLoad[T](&self.n, order) }
 	}
 
 	// Atomically assigns to value.
-	fn Store(mut self, val: T, order: MemoryOrder) {
+	fn Store(mut self, val: T, order: memoryOrder) {
 		unsafe { runtime::atomicStore[T](&self.n, &val, order) }
 	}
 }
@@ -111,30 +109,30 @@ type Uintptr = number[uintptr]
 
 // Atomically stores new into addr and returns the previous addr value.
 // Only integer types are supported.
-fn Swap[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, new: T, order: MemoryOrder): (old: T) {
+fn Swap[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, new: T, order: memoryOrder): (old: T) {
 	ret unsafe { runtime::atomicSwap[T](&addr, &new, order) }
 }
 
 // Executes the compare-and-swap operation for value.
 // Only integer types are supported.
-fn CompareSwap[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, old: T, new: T, order: MemoryOrder): (swapped: bool) {
+fn CompareSwap[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, old: T, new: T, order: memoryOrder): (swapped: bool) {
 	ret unsafe { runtime::atomicCompareSwap[T](&addr, &old, &new, order, order) }
 }
 
 // Atomically adds delta to addr and returns the previous addr value.
 // Only integer types are supported.
-fn Add[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, delta: T, order: MemoryOrder): (old: T) {
+fn Add[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, delta: T, order: memoryOrder): (old: T) {
 	ret unsafe { runtime::atomicAdd[T](&addr, delta, order) }
 }
 
 // Atomically loads addr.
 // Only integer types are supported.
-fn Load[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](&addr: T, order: MemoryOrder): T {
+fn Load[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](&addr: T, order: memoryOrder): T {
 	ret unsafe { runtime::atomicLoad[T](&addr, order) }
 }
 
 // Atomically stores val into addr.
 // Only integer types are supported.
-fn Store[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, val: T, order: MemoryOrder) {
+fn Store[T: int | uint | i8 | i16 | i32 | i64 | u8 | u16 | u32 | u64 | uintptr](mut &addr: T, val: T, order: memoryOrder) {
 	unsafe { runtime::atomicStore[T](&addr, &val, order) }
 }
\ No newline at end of file
diff --git a/std/sync/mutex.jule b/std/sync/mutex.jule
index 7aec2007..873ea2c9 100644
--- a/std/sync/mutex.jule
+++ b/std/sync/mutex.jule
@@ -36,7 +36,7 @@ impl Mutex {
 	// Unlock the mutex you locked and make it open
 	// to locking by the thread.
 	fn Unlock(self) {
-		old := atomic::Add(self.state, -mutexLocked, atomic::MemoryOrder.SeqCst)
+		old := atomic::Add(self.state, -mutexLocked, atomic::SeqCst)
 		if old == 0 {
 			panic("sync: Mutex: unlock of unlocked mutex")
 		}
@@ -47,6 +47,6 @@ impl Mutex {
 	// to lock. Returns true if the locking was
 	// successful, false otherwise.
 	fn TryLock(self): bool {
-		ret atomic::CompareSwap(self.state, mutexUnlocked, mutexLocked, atomic::MemoryOrder.SeqCst)
+		ret atomic::CompareSwap(self.state, mutexUnlocked, mutexLocked, atomic::SeqCst)
 	}
 }
\ No newline at end of file
diff --git a/std/sync/once.jule b/std/sync/once.jule
index c45fa4c3..1b19c7a1 100644
--- a/std/sync/once.jule
+++ b/std/sync/once.jule
@@ -90,7 +90,7 @@ impl Once {
 		// This is why the slow path falls back to a mutex, and why
 		// the self.done.store must be delayed until after f returns.
 
-		if self.done.Load(atomic::MemoryOrder.Relaxed) == 0 {
+		if self.done.Load(atomic::Relaxed) == 0 {
 			// Outlined slow-path to allow inlining of the fast-path.
 			self.doSlow(f)
 		}
@@ -98,9 +98,9 @@ impl Once {
 
 	fn doSlow(self, f: fn()) {
 		self.m.Lock()
-		if self.done.Load(atomic::MemoryOrder.Relaxed) == 0 {
+		if self.done.Load(atomic::Relaxed) == 0 {
 			f()
-			self.done.Store(1, atomic::MemoryOrder.Relaxed)
+			self.done.Store(1, atomic::Relaxed)
 		}
 		self.m.Unlock()
 	}
diff --git a/std/sync/waitgroup.jule b/std/sync/waitgroup.jule
index 6b585786..1290ebb4 100644
--- a/std/sync/waitgroup.jule
+++ b/std/sync/waitgroup.jule
@@ -28,7 +28,7 @@ impl WaitGroup {
 	// and unblocks any wait() calls if task count becomes zero.
 	// Panics if task count reaches below zero.
 	fn Add(mut self, delta: int) {
-		oldTask := int(self.taskN.Add(u32(delta), atomic::MemoryOrder.Relaxed))
+		oldTask := int(self.taskN.Add(u32(delta), atomic::Relaxed))
 		nTask := oldTask + delta
 		if nTask < 0 {
 			panic("sync: WaitGroup.Add: negative number of tasks")
@@ -42,12 +42,12 @@ impl WaitGroup {
 
 		// Number of tasks reaches to zero, therefore clear waiters.
 		for {
-			nWaiters := self.waitN.Load(atomic::MemoryOrder.Relaxed)
+			nWaiters := self.waitN.Load(atomic::Relaxed)
 			if nWaiters == 0 {
 				ret
 			}
 
-			if self.waitN.CompareSwap(nWaiters, 0, atomic::MemoryOrder.Relaxed) {
+			if self.waitN.CompareSwap(nWaiters, 0, atomic::Relaxed) {
 				ret
 			}
 		}
@@ -58,17 +58,17 @@ impl WaitGroup {
 
 	// Blocks until all tasks are done (task count becomes zero)
 	fn Wait(mut self) {
-		nTask := self.taskN.Load(atomic::MemoryOrder.Relaxed)
+		nTask := self.taskN.Load(atomic::Relaxed)
 		if nTask == 0 {
 			// No task, no need to wait.
 			ret
 		}
 
 		// Register this wait call to waiters.
-		self.waitN.Add(1, atomic::MemoryOrder.Relaxed)
+		self.waitN.Add(1, atomic::Relaxed)
 
 		// Wait for clearing waiters.
-		for self.waitN.Load(atomic::MemoryOrder.Relaxed) != 0 {
+		for self.waitN.Load(atomic::Relaxed) != 0 {
 		}
 	}
 }
\ No newline at end of file