diff --git a/Source/sync.cpp b/Source/sync.cpp
index 7ef5f085e..268b08a92 100644
--- a/Source/sync.cpp
+++ b/Source/sync.cpp
@@ -222,8 +222,7 @@ static void sync_monster(int pnum, const TSyncMonster *p)
 		return;
 	}
 
-	Point md = abs(monster[ndx].position.tile - Point { p->_mx, p->_my });
-	if (md.x <= 2 && md.y <= 2) {
+	if (monster[ndx].position.tile.WalkingDistance({ p->_mx, p->_my }) <= 2) {
 		if (monster[ndx]._mmode < MM_WALK || monster[ndx]._mmode > MM_WALK3) {
 			Direction md = GetDirection(monster[ndx].position.tile, { p->_mx, p->_my });
 			if (DirOK(ndx, md)) {