diff --git a/cpu/blackfin/start.S b/cpu/blackfin/start.S
index f351fab170..9975a0c62f 100644
--- a/cpu/blackfin/start.S
+++ b/cpu/blackfin/start.S
@@ -193,11 +193,8 @@ ENTRY(_start)
 	p1.l = .Lenable_nested;
 	p1.h = .Lenable_nested;
 	[p0] = p1;
-	p2.l = LO(IMASK);
-	p2.h = HI(IMASK);
-	p3.l = LO(EVT_IVG15);
-	p3.h = HI(EVT_IVG15);
-	[p2] = p3;
+	r7 = EVT_IVG15 (z);
+	sti r7;
 	raise 15;
 	p4.l = .LWAIT_HERE;
 	p4.h = .LWAIT_HERE;