diff --git a/Sources/ThreadLocal/ThreadLocal.swift b/Sources/ThreadLocal/ThreadLocal.swift
index 9cd350b..c60464c 100644
--- a/Sources/ThreadLocal/ThreadLocal.swift
+++ b/Sources/ThreadLocal/ThreadLocal.swift
@@ -32,7 +32,7 @@ public final class ThreadLocal<Value>: Sendable {
         return unmanaged.takeUnretainedValue()
     }
     
-    @_unavailableFromAsync
+    @available(*, noasync)
     public init(_deallocator deallocator: Deallocator = .default) {
         _key = pthread_key_t()
         _deallocator = deallocator
@@ -51,14 +51,14 @@ public final class ThreadLocal<Value>: Sendable {
         precondition(status == 0, "pthread_key_create failed with status code \(status)")
     }
     
+    @available(*, noasync)
     @inlinable
-    @_unavailableFromAsync
     func _makeBox(_ value: Value) -> _Box {
         _Box(_value: value, deallocator: _deallocator)
     }
     
+    @available(*, noasync)
     @inlinable
-    @_unavailableFromAsync
     public func _get(default: @autoclosure () -> Value) -> Value {
         if let value = _box?._value {
             return value
@@ -69,8 +69,8 @@ public final class ThreadLocal<Value>: Sendable {
         }
     }
     
+    @available(*, noasync)
     @inlinable
-    @_unavailableFromAsync
     public func _set(_ newValue: Value?) {
         let unmanaged = pthread_getspecific(_key).map {
             Unmanaged<_Box>.fromOpaque($0)
diff --git a/Sources/ThreadLocalMacros/ThreadLocalMacro.swift b/Sources/ThreadLocalMacros/ThreadLocalMacro.swift
index edfb9ec..b282eac 100644
--- a/Sources/ThreadLocalMacros/ThreadLocalMacro.swift
+++ b/Sources/ThreadLocalMacros/ThreadLocalMacro.swift
@@ -43,20 +43,20 @@ extension ThreadLocalMacro: AccessorMacro {
         }
         let getAccessor: AccessorDeclSyntax = if let initializer = binding.initializer {
             """
-            get {
+            @available(*, noasync) get {
                 _\(identifier)._get(default: \(initializer.value))
             }
             """
         } else {
             """
-            get {
+            @available(*, noasync) get {
                 _\(identifier)._get(default: nil)
             }
             """
         }
         let setAccessor: AccessorDeclSyntax =
         """
-        set {
+        @available(*, noasync) set {
             _\(identifier)._set(newValue)
         }
         """
diff --git a/Tests/ThreadLocalTests/ThreadLocalMacroTests.swift b/Tests/ThreadLocalTests/ThreadLocalMacroTests.swift
index 1fee28e..8bd3394 100644
--- a/Tests/ThreadLocalTests/ThreadLocalMacroTests.swift
+++ b/Tests/ThreadLocalTests/ThreadLocalMacroTests.swift
@@ -31,10 +31,10 @@ struct ThreadLocalMacroTests {
             expandedSource:
             """
             static var counter: Int {
-                get {
+                @available(*, noasync) get {
                     _counter._get(default: 0)
                 }
-                set {
+                @available(*, noasync) set {
                     _counter._set(newValue)
                 }
             }
@@ -55,10 +55,10 @@ struct ThreadLocalMacroTests {
             expandedSource:
             """
             @inlinable static var counter: Int {
-                get {
+                @available(*, noasync) get {
                     _counter._get(default: 0)
                 }
-                set {
+                @available(*, noasync) set {
                     _counter._set(newValue)
                 }
             }
@@ -79,10 +79,10 @@ struct ThreadLocalMacroTests {
             expandedSource:
             """
             static var ctx: OpaquePointer {
-                get {
+                @available(*, noasync) get {
                     _ctx._get(default: ZSTD_createCCtx())
                 }
-                set {
+                @available(*, noasync) set {
                     _ctx._set(newValue)
                 }
             }
@@ -104,10 +104,10 @@ struct ThreadLocalMacroTests {
             expandedSource:
             """
             public static var counter: Int {
-                get {
+                @available(*, noasync) get {
                     _counter._get(default: 0)
                 }
-                set {
+                @available(*, noasync) set {
                     _counter._set(newValue)
                 }
             }
@@ -148,10 +148,10 @@ struct ThreadLocalMacroTests {
             expandedSource:
             """
             static var counter: Int {
-                get {
+                @available(*, noasync) get {
                     _counter._get(default: 0)
                 }
-                set {
+                @available(*, noasync) set {
                     _counter._set(newValue)
                 }
             }