diff --git a/util/opt/backward.c b/util/opt/backward.c
index a774dc6a5..ec2218637 100644
--- a/util/opt/backward.c
+++ b/util/opt/backward.c
@@ -165,6 +165,7 @@ backward() {
 		case ps_mes:
 			if (prodepth != 0 &&
 			    ((int) aoff(lnp->l_a.la_arg, 0) == ms_std ||
+			     (int) aoff(lnp->l_a.la_arg, 0) == ms_stb ||
 			     (int) aoff(lnp->l_a.la_arg, 0) == ms_ego)) {
 				lnp->l_next = i;
 				i = lnp;