diff --git a/ChangeLog b/ChangeLog
index c3251974..ecb0f7e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+L1VM - (1.4.3)
+	VM: main function now uses wait loop thread 1 on macOS only.
+	On macOS the main program will run in thread 0. This is needed to run the SDL module.
+	It can only be run from main program!
+	The other OS will run the VM bytecode in thread 1.
+
+-- Stefan Pietzonke <jay-t@gmx.net> Sun 09 Jan 2021 16:45 +0100
+
 L1VM - (1.4.2)
 
 JIT-compiler now sets a return code for run function and exits the program on error!
diff --git a/include/global.h b/include/global.h
index f78db508..ff0b1589 100644
--- a/include/global.h
+++ b/include/global.h
@@ -104,7 +104,7 @@
 // info strings:
 #define COPYRIGHT_STR " (C) 2017-2022 Stefan Pietzonke"
 
-#define  VM_VERSION_STR		"1.4.2"		// version number
+#define  VM_VERSION_STR		"1.4.3"		// version number
 
 // no user defined definitions below this section! ============================
 
diff --git a/vm/main.c b/vm/main.c
index 283423d1..da5a085f 100644
--- a/vm/main.c
+++ b/vm/main.c
@@ -3126,6 +3126,8 @@ int main (int ac, char *av[])
 	threaddata[new_cpu].sp_bottom_thread = threaddata[new_cpu].sp_bottom + (new_cpu * stack_size);
 	threaddata[new_cpu].ep_startpos = 16;
 
+	// on macOS use wait loop thread, because the SDL module must be run from main thread!!!
+	#if __MACH__
 	new_cpu++;
     if (pthread_create (&id, NULL, (void *) run_main_loop_thread, (void *) new_cpu) != 0)
 	{
@@ -3137,6 +3139,14 @@ int main (int ac, char *av[])
 
 	// start main thread
 	run (0);
+	#else
+	if (pthread_create (&id, NULL, (void *) run, (void *) new_cpu) != 0)
+	{
+		printf ("ERROR: can't start main thread!\n");
+		cleanup ();
+		exit (1);
+	}
+	#endif
 
     pthread_join (id, NULL);
 	cleanup ();