diff --git a/include/pocketpy/objects/base.h b/include/pocketpy/objects/base.h
index 22e7f051..be3714c4 100644
--- a/include/pocketpy/objects/base.h
+++ b/include/pocketpy/objects/base.h
@@ -4,7 +4,7 @@
 
 typedef struct PyObject PyObject;
 typedef struct VM VM;
-extern _Thread_local VM* pk_current_vm;
+extern PK_THREAD_LOCAL VM* pk_current_vm;
 
 typedef struct py_TValue {
     py_Type type;
diff --git a/src/public/GlobalSetup.c b/src/public/GlobalSetup.c
index d4d044fc..5c749544 100644
--- a/src/public/GlobalSetup.c
+++ b/src/public/GlobalSetup.c
@@ -5,7 +5,7 @@
 #include "pocketpy/common/name.h"
 #include "pocketpy/interpreter/vm.h"
 
-_Thread_local VM* pk_current_vm;
+PK_THREAD_LOCAL VM* pk_current_vm;
 
 static bool pk_initialized;
 static bool pk_finalized;