diff --git a/src/common/kernel/unit.c b/src/common/kernel/unit.c
index a8c9c907f..486aede30 100644
--- a/src/common/kernel/unit.c
+++ b/src/common/kernel/unit.c
@@ -832,6 +832,7 @@ u_setfaction(unit * u, faction * f)
 	u->prevF = NULL;
 
   u->faction = f;
+  update_interval(f, u->region);
 	if (cnt && f) {
 		set_number(u, cnt);
     if (playerrace(u->race)) {