diff --git a/src/lib/subs/lndsub.c b/src/lib/subs/lndsub.c
index 2f678630..db520020 100644
--- a/src/lib/subs/lndsub.c
+++ b/src/lib/subs/lndsub.c
@@ -1021,7 +1021,8 @@ lnd_mar_one_sector(struct emp_qelem *list, int dir, natid actor)
     if (CANT_HAPPEN(QEMPTY(list)))
 	return 1;
 
-    if (dir <= DIR_STOP || dir >= DIR_VIEW) {
+    if (dir <= DIR_STOP || dir > DIR_LAST) {
+	CANT_HAPPEN(dir != DIR_STOP);
 	lnd_mar_put(list, actor);
 	return 1;
     }
diff --git a/src/lib/subs/shpsub.c b/src/lib/subs/shpsub.c
index 2182a4a2..58262fdc 100644
--- a/src/lib/subs/shpsub.c
+++ b/src/lib/subs/shpsub.c
@@ -796,7 +796,8 @@ shp_nav_one_sector(struct emp_qelem *list, int dir, natid actor)
     if (CANT_HAPPEN(QEMPTY(list)))
 	return 1;
 
-    if (dir <= DIR_STOP || dir >= DIR_VIEW) {
+    if (dir <= DIR_STOP || dir > DIR_LAST) {
+	CANT_HAPPEN(dir != DIR_STOP);
 	shp_nav_put(list, actor);
 	return 1;
     }