diff --git a/bin/sh/var.c b/bin/sh/var.c
index 42f9556aad7b..0758289151ba 100644
--- a/bin/sh/var.c
+++ b/bin/sh/var.c
@@ -558,13 +558,13 @@ environment(void)
 	nenv = 0;
 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
 		for (vp = *vpp ; vp ; vp = vp->next)
-			if (vp->flags & VEXPORT)
+			if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT)
 				nenv++;
 	}
 	ep = env = stalloc((nenv + 1) * sizeof *env);
 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
 		for (vp = *vpp ; vp ; vp = vp->next)
-			if (vp->flags & VEXPORT)
+			if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT)
 				*ep++ = vp->text;
 	}
 	*ep = NULL;