diff --git a/src/MultilevelAStarEx.cpp b/src/MultilevelAStarEx.cpp
index a5a3b73..7eb34fa 100644
--- a/src/MultilevelAStarEx.cpp
+++ b/src/MultilevelAStarEx.cpp
@@ -6,7 +6,6 @@
 
 #include <set>
 
-#define TERRAIN(x, y) (_terrain[(x) + (y) * _width])
 #define NODES(x, y) (_nodes[(x) + (y) * _width])
 
 using namespace godot;
@@ -19,6 +18,7 @@ Node::Node() { }
 Node::Node(int x, int y)
 {
 	this->hasUnit = false;
+	this->terrainType = BLOCKED;
 
 	this->openPass = 0;
 	this->closedPass = 0;
@@ -152,7 +152,6 @@ void MultilevelAStarEx::init(const Rect2i &region)
 	_height = region.get_size().height;
 	_trans = region.get_position();
 
-	_terrain.resize(_width * _height, BLOCKED);
 	_nodes.resize(_width * _height);
 
 	std::vector<Node>::iterator iter = _nodes.begin();
@@ -180,16 +179,16 @@ void MultilevelAStarEx::set_terrain(const Vector2i &cell, TerrainType type)
 	DEV_ASSERT(_region.has_point(cell));
 
 	Vector2i cell2 = cell - _trans;
-	TERRAIN(cell2.x, cell2.y) = type;
+	NODES(cell2.x, cell2.y).terrainType = type;
 }
 
-MultilevelAStarEx::TerrainType MultilevelAStarEx::get_terrain(const Vector2i &cell) const
+TerrainType MultilevelAStarEx::get_terrain(const Vector2i &cell) const
 {
 	DEV_ASSERT(_init);
 	DEV_ASSERT(_region.has_point(cell));
 
 	Vector2i cell2 = cell - _trans;
-	return TERRAIN(cell2.x, cell2.y);
+	return NODES(cell2.x, cell2.y).terrainType;
 }
 
 void MultilevelAStarEx::set_unit(const Vector2i &cell, bool blocked)
@@ -214,8 +213,8 @@ bool MultilevelAStarEx::can_move(const Node *current, int x, int y) const
 {
 	if (NODES(x, y).hasUnit) return false;
 
-	TerrainType tc = TERRAIN(current->x, current->y);
-	TerrainType td = TERRAIN(x, y);
+	TerrainType tc = NODES(current->x, current->y).terrainType;
+	TerrainType td = NODES(x, y).terrainType;
 
 	if (td == BLOCKED)
 	{
diff --git a/src/MultilevelAStarEx.h b/src/MultilevelAStarEx.h
index 6da2eba..a91d5f0 100644
--- a/src/MultilevelAStarEx.h
+++ b/src/MultilevelAStarEx.h
@@ -10,6 +10,13 @@
 
 namespace godot {
 
+enum TerrainType : int
+{
+	STAIRS = -1,
+	BLOCKED = 0,
+	GROUND = 1,
+};
+
 class Node {
 	friend class MultilevelAStarEx;
 
@@ -21,6 +28,7 @@ public:
 
 private:
 	bool hasUnit;
+	TerrainType terrainType;
 
 	int openPass, closedPass;
 	int x, y;
@@ -47,18 +55,9 @@ class MultilevelAStarEx : public RefCounted
 {
 	GDCLASS(MultilevelAStarEx, RefCounted)
 
-public:
-	enum TerrainType
-	{
-		STAIRS = -1,
-		BLOCKED = 0,
-		GROUND = 1,
-	};
-
 private:
 	bool _init;
 	int _pass;
-	std::vector<TerrainType> _terrain;
 	std::vector<Node> _nodes;
 
 	Rect2i _region;
@@ -86,6 +85,6 @@ public:
 
 }
 
-VARIANT_ENUM_CAST(MultilevelAStarEx::TerrainType);
+VARIANT_ENUM_CAST(TerrainType);
 
 #endif
\ No newline at end of file