diff --git a/test/tls_foreign_dtor.c b/test/tls_foreign_dtor.c
index 8be3bbf783..3836a8ace7 100644
--- a/test/tls_foreign_dtor.c
+++ b/test/tls_foreign_dtor.c
@@ -25,8 +25,9 @@ tls_destructor(void* ptr)
     _MCF_atomic_xadd_32_rlx(ptr, 1);
   }
 
-static __attribute__((__stdcall__))
+static
 DWORD
+__stdcall
 thread_proc(LPVOID param)
   {
     _MCF_sem_wait(&start, __MCF_nullptr);
diff --git a/test/tls_foreign_dtor_thread_exit.c b/test/tls_foreign_dtor_thread_exit.c
index 6e3fd85fb5..9359354885 100644
--- a/test/tls_foreign_dtor_thread_exit.c
+++ b/test/tls_foreign_dtor_thread_exit.c
@@ -20,8 +20,9 @@ tls_dtor(void* ptr)
     __MCF__Exit(*(int*) ptr);
   }
 
-static __attribute__((__stdcall__))
+static
 DWORD
+__stdcall
 thread_proc(LPVOID param)
   {
     _MCF_tls_key* key = _MCF_tls_key_new(tls_dtor);
diff --git a/test/tls_foreign_xset.c b/test/tls_foreign_xset.c
index 084f46fba4..3201f321d2 100644
--- a/test/tls_foreign_xset.c
+++ b/test/tls_foreign_xset.c
@@ -14,8 +14,9 @@ static _MCF_tls_key* key;
 static HANDLE thrd;
 static int dso_1, dso_2;
 
-static __attribute__((__stdcall__))
+static
 DWORD
+__stdcall
 thread_proc(LPVOID param)
   {
     void* p;