diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 868462d..857afa1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@ set(JUCI_SHARED_FILES
   json.cpp
   menu.cpp
   meson.cpp
+  mutex.cpp
   project_build.cpp
   snippets.cpp
   source.cpp
diff --git a/src/mutex.cpp b/src/mutex.cpp
new file mode 100644
index 0000000..a2aa12e
--- /dev/null
+++ b/src/mutex.cpp
@@ -0,0 +1,39 @@
+#include "mutex.hpp"
+
+#if defined(__clang__) && (!defined(SWIG))
+#pragma GCC diagnostic ignored "-Wthread-safety"
+#endif
+
+void Mutex::lock() {
+  mutex.lock();
+}
+
+bool Mutex::try_lock() {
+  return mutex.try_lock();
+}
+
+void Mutex::unlock() {
+  mutex.unlock();
+}
+
+const Mutex &Mutex::operator!() const { return *this; }
+
+LockGuard::LockGuard(Mutex &mutex_) : mutex(mutex_) {
+  mutex.lock();
+  locked = true;
+}
+
+void LockGuard::lock() {
+  mutex.lock();
+  locked = true;
+}
+
+void LockGuard::unlock() {
+  mutex.unlock();
+  locked = false;
+}
+
+LockGuard::~LockGuard() {
+  if(locked)
+    mutex.unlock();
+}
diff --git a/src/mutex.hpp b/src/mutex.hpp
index 2720e7e..e3cac9a 100644
--- a/src/mutex.hpp
+++ b/src/mutex.hpp
@@ -3,8 +3,8 @@
 
 #include <mutex>
 
-// Enable thread safety attributes only with clang. Exclude Apple Clang since it is too old.
-#if defined(__clang__) && !defined(SWIG) && !defined(__apple_build_version__)
+// Enable thread safety attributes only with clang.
+#if defined(__clang__) && (!defined(SWIG))
 #define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
 #else
 #define THREAD_ANNOTATION_ATTRIBUTE__(x) // no-op
@@ -72,19 +72,10 @@ class CAPABILITY("mutex") Mutex {
   std::mutex mutex;
 
 public:
-  void lock() ACQUIRE() {
-    mutex.lock();
-  }
-
-  bool try_lock() TRY_ACQUIRE(true) {
-    return mutex.try_lock();
-  }
-
-  void unlock() RELEASE() {
-    mutex.unlock();
-  }
-
-  const Mutex &operator!() const { return *this; }
+  void lock() ACQUIRE();
+  bool try_lock() TRY_ACQUIRE(true);
+  void unlock() RELEASE();
+  const Mutex &operator!() const;
 };
 
 /// Use this class instead of std::lock_guard and std::unique_lock
@@ -93,20 +84,8 @@ class SCOPED_CAPABILITY LockGuard {
   bool locked;
 
 public:
-  LockGuard(Mutex &mutex_) ACQUIRE(mutex_) : mutex(mutex_) {
-    mutex.lock();
-    locked = true;
-  }
-  void lock() ACQUIRE() {
-    mutex.lock();
-    locked = true;
-  }
-  void unlock() RELEASE() {
-    mutex.unlock();
-    locked = false;
-  }
-  ~LockGuard() RELEASE() {
-    if(locked)
-      mutex.unlock();
-  }
+  LockGuard(Mutex &mutex_) ACQUIRE(mutex_);
+  void lock() ACQUIRE();
+  void unlock() RELEASE();
+  ~LockGuard() RELEASE();
 };