diff --git a/mach/sun3/libsys/head_em.s b/mach/sun3/libsys/head_em.s
index bc219095a..94899b537 100644
--- a/mach/sun3/libsys/head_em.s
+++ b/mach/sun3/libsys/head_em.s
@@ -1,5 +1,5 @@
 .define .lino,.filn
-.define EXIT
+.define EXIT, WRITE, BRK
 .define	begtext,begdata,begbss
 .define	EARRAY,ERANGE,ESET,EIDIVZ,EHEAP,EILLINS,ECASE,EBADGTO
 .define	hol0,.reghp,.limhp,.trpim,.trppc
@@ -43,6 +43,12 @@ begtext:
 EXIT:
 	jsr	(__exit)
 
+WRITE:
+	jmp	(__write)
+
+BRK:
+	jmp	(__brk)
+
 	.sect .data
 begdata:
 	.data4 0		! may be at virtual address 0 with no problem