diff --git a/BaS_gcc/sys/exceptions.S b/BaS_gcc/sys/exceptions.S
index 5e249da..8c3fdbf 100644
--- a/BaS_gcc/sys/exceptions.S
+++ b/BaS_gcc/sys/exceptions.S
@@ -990,6 +990,7 @@ video_chg_end:
 		.extern	_isr_execute_handler
 
 _lowlevel_isr_handler:
+		move.w	#0x2700,sr
 		link	a6,#-4*4
 		movem.l	d0-d1/a0-a1,(sp)