diff --git a/mach/vax4/libbsd4_2/brk.s b/mach/vax4/libbsd4_2/brk.s
index bd7ba258e..3d2f8c4a0 100644
--- a/mach/vax4/libbsd4_2/brk.s
+++ b/mach/vax4/libbsd4_2/brk.s
@@ -14,7 +14,7 @@ Ierr:
 	jmp	cerror
 
 DEFINE(_sbrk)
-	addl3	cur,4(ap),-(sp)
+	addl3	Icur,4(ap),-(sp)
 	bcs	Ierr
 	pushl	$1
 	movl	ap,r3