diff --git a/library/terraman_library.cpp b/library/terraman_library.cpp
index ef1dd00..4282af9 100644
--- a/library/terraman_library.cpp
+++ b/library/terraman_library.cpp
@@ -67,11 +67,11 @@ Ref<Material> TerramanLibrary::material_lod_get(const int index) {
 	return _materials[index];
 }
 
-Variant TerramanLibrary::material_cached_get_key(const Ref<TerraChunk> &chunk) {
+int TerramanLibrary::material_cached_get_key(const Ref<TerraChunk> &chunk) {
 	return call("_material_cached_get_key", chunk);
 }
 
-Variant TerramanLibrary::_material_cached_get_key(Ref<TerraChunk> chunk) {
+int TerramanLibrary::_material_cached_get_key(Ref<TerraChunk> chunk) {
 	return 0;
 }
 
@@ -142,11 +142,11 @@ Ref<Material> TerramanLibrary::liquid_material_lod_get(const int index) {
 	return _liquid_materials[index];
 }
 
-Variant TerramanLibrary::liquid_material_cached_get_key(const Ref<TerraChunk> &chunk) {
+int TerramanLibrary::liquid_material_cached_get_key(const Ref<TerraChunk> &chunk) {
 	return call("_liquid_material_cached_get_key", chunk);
 }
 
-Variant TerramanLibrary::_liquid_material_cached_get_key(Ref<TerraChunk> chunk) {
+int TerramanLibrary::_liquid_material_cached_get_key(Ref<TerraChunk> chunk) {
 	return 0;
 }
 
@@ -217,11 +217,11 @@ Ref<Material> TerramanLibrary::prop_material_lod_get(const int index) {
 	return _prop_materials[index];
 }
 
-Variant TerramanLibrary::prop_material_cached_get_key(const Ref<TerraChunk> &chunk) {
+int TerramanLibrary::prop_material_cached_get_key(const Ref<TerraChunk> &chunk) {
 	return call("_prop_material_cached_get_key", chunk);
 }
 
-Variant TerramanLibrary::_prop_material_cached_get_key(Ref<TerraChunk> chunk) {
+int TerramanLibrary::_prop_material_cached_get_key(Ref<TerraChunk> chunk) {
 	return 0;
 }
 
diff --git a/library/terraman_library.h b/library/terraman_library.h
index df9d9cc..fc6b0be 100644
--- a/library/terraman_library.h
+++ b/library/terraman_library.h
@@ -71,8 +71,8 @@ public:
 	Ref<Material> material_get(const int index);
 	Ref<Material> material_lod_get(const int index);
 
-	Variant material_cached_get_key(const Ref<TerraChunk> &chunk);
-	virtual Variant _material_cached_get_key(Ref<TerraChunk> chunk);
+	int material_cached_get_key(const Ref<TerraChunk> &chunk);
+	virtual int _material_cached_get_key(Ref<TerraChunk> chunk);
 	Ref<Material> material_lod_cached_get(const int index, const int key);
 	virtual Ref<Material> _material_lod_cached_get(const int index, const int key);
 
@@ -88,8 +88,8 @@ public:
 	Ref<Material> liquid_material_get(const int index);
 	Ref<Material> liquid_material_lod_get(const int index);
 
-	Variant liquid_material_cached_get_key(const Ref<TerraChunk> &chunk);
-	virtual Variant _liquid_material_cached_get_key(Ref<TerraChunk> chunk);
+	int liquid_material_cached_get_key(const Ref<TerraChunk> &chunk);
+	virtual int _liquid_material_cached_get_key(Ref<TerraChunk> chunk);
 	Ref<Material> liquid_material_lod_cached_get(const int index, const int key);
 	virtual Ref<Material> _liquid_material_lod_cached_get(const int index, const int key);
 
@@ -105,8 +105,8 @@ public:
 	Ref<Material> prop_material_get(const int index);
 	Ref<Material> prop_material_lod_get(const int index);
 
-	Variant prop_material_cached_get_key(const Ref<TerraChunk> &chunk);
-	virtual Variant _prop_material_cached_get_key(Ref<TerraChunk> chunk);
+	int prop_material_cached_get_key(const Ref<TerraChunk> &chunk);
+	virtual int _prop_material_cached_get_key(Ref<TerraChunk> chunk);
 	Ref<Material> prop_material_lod_cached_get(const int index, const int key);
 	virtual Ref<Material> _prop_material_lod_cached_get(const int index, const int key);