diff --git a/interior/floors/dungeon_01_interior_floor.res b/interior/floors/dungeon_01_interior_floor.res
index 8c9c100..79040f1 100644
--- a/interior/floors/dungeon_01_interior_floor.res
+++ b/interior/floors/dungeon_01_interior_floor.res
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8d5a0f5ed6c6c95b7d5041d9c4e3e079501fb10a1563c3fb6d384a34eaf52da5
-size 720
+oid sha256:ac5633d27be71198eed3e605daca451838f94a37503772ff56e5ee2177daf2e0
+size 712
diff --git a/interior/interior_map.gd b/interior/interior_map.gd
index 42d3bb3..1d9f20a 100644
--- a/interior/interior_map.gd
+++ b/interior/interior_map.gd
@@ -95,15 +95,18 @@ class Chunk:
 			# Find floor tile types.
 			for y in _CHUNK_SIZE:
 				for x in _CHUNK_SIZE:
-					if floor_map.get_bitv(offset + Vector2i(x, y)):
+					var map_area := Rect2i(Vector2.ZERO, map_size)
+					var map_coordinates := offset + Vector2i(x, y)
+
+					if map_area.has_point(map_coordinates) and floor_map.get_bitv(map_coordinates):
 						var tile := 0
 
 						for i in Orientation.values().size():
-							var delta_x := roundi(cos(i * PI / 2.0))
-							var delta_y := roundi(sin(i * PI / 2.0))
+							var map_neighbor := map_coordinates + Vector2i(
+								roundi(cos(i * PI / 2.0)), roundi(sin(i * PI / 2.0)))
 
-							if (0 <= (y + int(delta_y < map_size.y))) and (0 <= (x + int(delta_x < map_size.x))):
-								tile += int(floor_map.get_bit(x + delta_x, y + delta_y)) * 2 ** i
+							if map_area.has_point(map_neighbor):
+								tile += int(floor_map.get_bitv(map_neighbor)) * 2 ** i
 
 						positions_by_floor_tile[tile].append(Vector2(x, y))
 
diff --git a/map_editor.scn b/map_editor.scn
index 02becdc..cb425e2 100644
--- a/map_editor.scn
+++ b/map_editor.scn
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:d12a2d80760eab79b3b1a376f5b8ed1a8f35a4551dee8ee8dd220fce013b18f9
-size 13514
+oid sha256:fade16a9713f46ed71eec62081880231b6f5be125c6401cf0944abc443f1b2c7
+size 13516