diff --git a/mach/vax4/libbsd4_2/cerror.s b/mach/vax4/libbsd4_2/cerror.s
index cbd332aaa..27af5b390 100644
--- a/mach/vax4/libbsd4_2/cerror.s
+++ b/mach/vax4/libbsd4_2/cerror.s
@@ -1,5 +1,7 @@
-	.globl	_errno
+	.globl	_errno, cerror
+.comm _errno, 4
 cerror:
 	movl	r0,_errno
 	mnegl	$1,r0
 	ret
+