diff --git a/mach/pmds4/libsys/sbrk.s b/mach/pmds4/libsys/sbrk.s
index aae02474b..490cd0491 100644
--- a/mach/pmds4/libsys/sbrk.s
+++ b/mach/pmds4/libsys/sbrk.s
@@ -5,7 +5,7 @@
 _sbrk:		tst.b	-8(sp)
 			move.l	4(sp),d0
 			beq	1f
-			add.l	nd,d0
+			add.l	.reghp,d0
 			move.l	d0,-(sp)
 			clr.l	-(sp)
 			trap #0
@@ -14,18 +14,15 @@ _sbrk:		tst.b	-8(sp)
 			bcc	1f
 			jmp	cerror
 1:
-			move.l	nd,d0
+			move.l	.reghp,d0
 			move.l	4(sp),d1
-			add.l	d1,nd
+			add.l	d1,.reghp
 			rts
 _brk:			trap #0
 .short	0x11
 			bcc	1f
 			jmp	cerror
 1:
-			move.l	4(sp),nd
+			move.l	4(sp),.reghp
 			clr.l	d0
 			rts
-.data
-nd:			.long endbss
-.text