diff --git a/main.py b/main.py
index cfe9f6b..84443cb 100644
--- a/main.py
+++ b/main.py
@@ -13,7 +13,7 @@
 recompute_fov = True
 def can_pass(x, y):
 	global recompute_fov
-	recompute_fov = map.map[y][x].passable()
+	recompute_fov = map.can_walk(x, y)
 	return recompute_fov
 
 def main_loop():
diff --git a/map.py b/map.py
index 3178bdd..1ac7647 100644
--- a/map.py
+++ b/map.py
@@ -62,3 +62,6 @@ def find_random_square(self, occupied):
 					return x, y
 		#if nothing found - let's try once again
 		return self.find_random_square(occupied)
+
+	def can_walk(self, x, y):
+		return self.map[y][x].passable() and not self.has_critter_at( (x, y))