diff --git a/src/move.c b/src/move.c
index 4a9bd7ba7..d8c0f5cd2 100644
--- a/src/move.c
+++ b/src/move.c
@@ -913,6 +913,8 @@ static unit *bewegung_blockiert_von(unit * reisender, region * r)
             int sk = eff_skill(u, SK_PERCEPTION, r);
             if (invisible(reisender, u) >= reisender->number)
                 continue;
+            if (!u_race(u)->flags & RCF_FLY && u_race(reisender)->flags & RCF_FLY)
+                continue;
             if ((u->faction == reisender->faction) || (ucontact(u, reisender)) || (alliedunit(u, reisender->faction, HELP_GUARD)))
                 guard_count = guard_count - u->number;
             else if (sk >= stealth) {
@@ -962,6 +964,8 @@ static bool is_guardian_u(const unit * guard, unit * u, unsigned int mask)
         return false;
     if (!cansee(guard->faction, u->region, u, 0))
         return false;
+    if (!u_race(guard)->flags & RCF_FLY && u_race(u)->flags & RCF_FLY)
+        return false;
 
     return true;
 }