diff --git a/mach/ns/libmon/head_em.s b/mach/ns/libmon/head_em.s
index 01bd631f4..f5135f7ef 100644
--- a/mach/ns/libmon/head_em.s
+++ b/mach/ns/libmon/head_em.s
@@ -1,6 +1,6 @@
 .define hol0,argv,.reghp,.limhp,envp,begbss
 .define .ignmask, .trpreg
-.define .stop
+.define .stop, BRK
 .define ERANGE,EILLINS,ECASE
 .sect .text
 .sect .rom
@@ -33,6 +33,12 @@ ECASE	= 20
 	jsr @.putchar
 	bpt
 
+BRK:
+	movd	0,r0
+	ret	0
+
+WRITE:	jump	@__write
+
 .sect .bss
 begbss:
 .sect .data