diff --git a/firmware/crt0.S b/firmware/crt0.S
index fe1fad8cac..78b26b77ea 100644
--- a/firmware/crt0.S
+++ b/firmware/crt0.S
@@ -109,6 +109,9 @@ munge_loop:
 	cmp/ge	r1,r2
 	bt	munge_loop
 	nop
+
+	mov     #0,r0
+	ldc     r0,gbr
 	
 	! call the mainline	
 	mov.l	main_k,r0