diff --git a/compiler-rt/lib/gwp_asan/CMakeLists.txt b/compiler-rt/lib/gwp_asan/CMakeLists.txt
--- a/compiler-rt/lib/gwp_asan/CMakeLists.txt
+++ b/compiler-rt/lib/gwp_asan/CMakeLists.txt
@@ -23,6 +23,8 @@
   options.h
   options.inc
   platform_specific/guarded_pool_allocator_tls.h
+  platform_specific/mutex_fuchsia.h
+  platform_specific/mutex_posix.h
   stack_trace_compressor.h
   utilities.h
 )
diff --git a/compiler-rt/lib/gwp_asan/mutex.h b/compiler-rt/lib/gwp_asan/mutex.h
--- a/compiler-rt/lib/gwp_asan/mutex.h
+++ b/compiler-rt/lib/gwp_asan/mutex.h
@@ -9,14 +9,11 @@
 #ifndef GWP_ASAN_MUTEX_H_
 #define GWP_ASAN_MUTEX_H_
 
-#ifdef __unix__
-#include <pthread.h>
-#else
-#error "GWP-ASan is not supported on this platform."
-#endif
+#include "gwp_asan/platform_specific/mutex_fuchsia.h"
+#include "gwp_asan/platform_specific/mutex_posix.h"
 
 namespace gwp_asan {
-class Mutex {
+class Mutex final : PlatformMutex {
 public:
   constexpr Mutex() = default;
   ~Mutex() = default;
@@ -28,11 +25,6 @@
   bool tryLock();
   // Unlock the mutex.
   void unlock();
-
-private:
-#ifdef __unix__
-  pthread_mutex_t Mu = PTHREAD_MUTEX_INITIALIZER;
-#endif // defined(__unix__)
 };
 
 class ScopedLock {
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.h b/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.h
new file mode 100644
--- /dev/null
+++ b/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.h
@@ -0,0 +1,23 @@
+//===-- mutex_fuchsia.h -----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#if defined(__Fuchsia__)
+#ifndef GWP_ASAN_MUTEX_FUCHSIA_H_
+#define GWP_ASAN_MUTEX_FUCHSIA_H_
+
+#include <lib/sync/mutex.h>
+
+namespace gwp_asan {
+class PlatformMutex {
+protected:
+  sync_mutex_t Mu = {};
+};
+} // namespace gwp_asan
+
+#endif // GWP_ASAN_MUTEX_FUCHSIA_H_
+#endif // defined(__Fuchsia__)
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.cpp b/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.cpp
new file mode 100644
--- /dev/null
+++ b/compiler-rt/lib/gwp_asan/platform_specific/mutex_fuchsia.cpp
@@ -0,0 +1,21 @@
+//===-- mutex_fuchsia.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "gwp_asan/mutex.h"
+
+#include <lib/sync/mutex.h>
+
+namespace gwp_asan {
+void Mutex::lock() __TA_NO_THREAD_SAFETY_ANALYSIS { sync_mutex_lock(&Mu); }
+
+bool Mutex::tryLock() __TA_NO_THREAD_SAFETY_ANALYSIS {
+  return sync_mutex_trylock(&Mu) == ZX_OK;
+}
+
+void Mutex::unlock() __TA_NO_THREAD_SAFETY_ANALYSIS { sync_mutex_unlock(&Mu); }
+} // namespace gwp_asan
diff --git a/compiler-rt/lib/gwp_asan/platform_specific/mutex_posix.h b/compiler-rt/lib/gwp_asan/platform_specific/mutex_posix.h
new file mode 100644
--- /dev/null
+++ b/compiler-rt/lib/gwp_asan/platform_specific/mutex_posix.h
@@ -0,0 +1,23 @@
+//===-- mutex_posix.h -------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#if defined(__unix__)
+#ifndef GWP_ASAN_MUTEX_POSIX_H_
+#define GWP_ASAN_MUTEX_POSIX_H_
+
+#include <pthread.h>
+
+namespace gwp_asan {
+class PlatformMutex {
+protected:
+  pthread_mutex_t Mu = PTHREAD_MUTEX_INITIALIZER;
+};
+} // namespace gwp_asan
+
+#endif // GWP_ASAN_MUTEX_POSIX_H_
+#endif // defined(__unix__)