diff --git a/Utilities/SMutex.cpp b/Utilities/SMutex.cpp
index 541d20b27..06820a7af 100644
--- a/Utilities/SMutex.cpp
+++ b/Utilities/SMutex.cpp
@@ -8,6 +8,8 @@ __forceinline void SM_Sleep()
 
 #ifdef _WIN32
 __declspec(thread)
+#elif __APPLE__
+__thread
 #else
 thread_local
 #endif
diff --git a/Utilities/Thread.cpp b/Utilities/Thread.cpp
index 940e6b94e..6ad547bff 100644
--- a/Utilities/Thread.cpp
+++ b/Utilities/Thread.cpp
@@ -3,6 +3,8 @@
 
 #ifdef _WIN32
 __declspec(thread)
+#elif __APPLE__
+__thread
 #else
 thread_local
 #endif