diff --git a/src/newgrf_commons.cpp b/src/newgrf_commons.cpp
index 071e4a108a..2508fa2726 100644
--- a/src/newgrf_commons.cpp
+++ b/src/newgrf_commons.cpp
@@ -312,10 +312,11 @@ void ObjectOverrideManager::SetEntitySpec(ObjectSpec *spec)
 		return;
 	}
 
-	extern ObjectSpec _object_specs[NUM_OBJECTS];
+	extern std::vector<ObjectSpec> _object_specs;
 
 	/* Now that we know we can use the given id, copy the spec to its final destination. */
-	memcpy(&_object_specs[type], spec, sizeof(*spec));
+	if (type >= _object_specs.size()) _object_specs.resize(type + 1);
+	_object_specs[type] = *spec;
 }
 
 /**
diff --git a/src/newgrf_object.cpp b/src/newgrf_object.cpp
index c7c2c770ee..a14f8d19ae 100644
--- a/src/newgrf_object.cpp
+++ b/src/newgrf_object.cpp
@@ -29,7 +29,12 @@ ObjectOverrideManager _object_mngr(NEW_OBJECT_OFFSET, NUM_OBJECTS, INVALID_OBJEC
 
 extern const ObjectSpec _original_objects[NEW_OBJECT_OFFSET];
 /** All the object specifications. */
-ObjectSpec _object_specs[NUM_OBJECTS];
+std::vector<ObjectSpec> _object_specs;
+
+size_t ObjectSpec::Count()
+{
+	return _object_specs.size();
+}
 
 /**
  * Get the specification associated with a specific ObjectType.
@@ -38,7 +43,11 @@ ObjectSpec _object_specs[NUM_OBJECTS];
  */
 /* static */ const ObjectSpec *ObjectSpec::Get(ObjectType index)
 {
+	/* Empty object if index is out of range -- this might happen if NewGRFs are changed. */
+	static ObjectSpec empty = {};
+
 	assert(index < NUM_OBJECTS);
+	if (index >= _object_specs.size()) return &empty;
 	return &_object_specs[index];
 }
 
@@ -87,7 +96,7 @@ bool ObjectSpec::IsAvailable() const
  */
 uint ObjectSpec::Index() const
 {
-	return this - _object_specs;
+	return this - _object_specs.data();
 }
 
 /**
@@ -106,14 +115,13 @@ uint ObjectSpec::Index() const
 void ResetObjects()
 {
 	/* Clean the pool. */
-	for (uint16 i = 0; i < NUM_OBJECTS; i++) {
-		_object_specs[i] = {};
-	}
+	_object_specs.clear();
 
 	/* And add our originals. */
-	MemCpyT(_object_specs, _original_objects, lengthof(_original_objects));
+	_object_specs.resize(lengthof(_original_objects));
 
 	for (uint16 i = 0; i < lengthof(_original_objects); i++) {
+		_object_specs[i] = _original_objects[i];
 		_object_specs[i].grf_prop.local_id = i;
 	}
 
diff --git a/src/newgrf_object.h b/src/newgrf_object.h
index f283e36407..df6958074e 100644
--- a/src/newgrf_object.h
+++ b/src/newgrf_object.h
@@ -99,6 +99,7 @@ struct ObjectSpec {
 	bool IsAvailable() const;
 	uint Index() const;
 
+	static size_t Count();
 	static const ObjectSpec *Get(ObjectType index);
 	static const ObjectSpec *GetByTile(TileIndex tile);
 
diff --git a/src/object_cmd.cpp b/src/object_cmd.cpp
index 5f37b6d1c7..ce423273f4 100644
--- a/src/object_cmd.cpp
+++ b/src/object_cmd.cpp
@@ -207,7 +207,7 @@ CommandCost CmdBuildObject(DoCommandFlag flags, TileIndex tile, ObjectType type,
 {
 	CommandCost cost(EXPENSES_CONSTRUCTION);
 
-	if (type >= NUM_OBJECTS) return CMD_ERROR;
+	if (type >= ObjectSpec::Count()) return CMD_ERROR;
 	const ObjectSpec *spec = ObjectSpec::Get(type);
 	if (_game_mode == GM_NORMAL && !spec->IsAvailable() && !_generating_world) return CMD_ERROR;
 	if ((_game_mode == GM_EDITOR || _generating_world) && !spec->WasEverAvailable()) return CMD_ERROR;
@@ -388,7 +388,7 @@ CommandCost CmdBuildObjectArea(DoCommandFlag flags, TileIndex tile, TileIndex st
 {
 	if (start_tile >= Map::Size()) return CMD_ERROR;
 
-	if (type >= NUM_OBJECTS) return CMD_ERROR;
+	if (type >= ObjectSpec::Count()) return CMD_ERROR;
 	const ObjectSpec *spec = ObjectSpec::Get(type);
 	if (view >= spec->views) return CMD_ERROR;
 
@@ -792,7 +792,7 @@ static bool TryBuildTransmitter()
 void GenerateObjects()
 {
 	/* Set a guestimate on how much we progress */
-	SetGeneratingWorldProgress(GWP_OBJECT, NUM_OBJECTS);
+	SetGeneratingWorldProgress(GWP_OBJECT, (uint)ObjectSpec::Count());
 
 	/* Determine number of water tiles at map border needed for freeform_edges */
 	uint num_water_tiles = 0;
@@ -808,7 +808,7 @@ void GenerateObjects()
 	}
 
 	/* Iterate over all possible object types */
-	for (uint i = 0; i < NUM_OBJECTS; i++) {
+	for (uint i = 0; i < ObjectSpec::Count(); i++) {
 		const ObjectSpec *spec = ObjectSpec::Get(i);
 
 		/* Continue, if the object was never available till now or shall not be placed */
diff --git a/src/object_gui.cpp b/src/object_gui.cpp
index 7fb8e93c6f..b617115d1e 100644
--- a/src/object_gui.cpp
+++ b/src/object_gui.cpp
@@ -275,11 +275,11 @@ public:
 				uint height[2] = {0, 0}; // The height for the different views; in this case views 1/2 and 4.
 
 				/* Get the height and view information. */
-				for (int i = 0; i < NUM_OBJECTS; i++) {
+				for (int i = 0; i < ObjectSpec::Count(); i++) {
 					const ObjectSpec *spec = ObjectSpec::Get(i);
 					if (!spec->IsEverAvailable()) continue;
 					two_wide |= spec->views >= 2;
-					height[spec->views / 4] = std::max<int>(ObjectSpec::Get(i)->height, height[spec->views / 4]);
+					height[spec->views / 4] = std::max<int>(spec->height, height[spec->views / 4]);
 				}
 
 				/* Determine the pixel heights. */
diff --git a/src/script/api/script_objecttype.cpp b/src/script/api/script_objecttype.cpp
index 7d74d9b8b8..842bdac4b7 100644
--- a/src/script/api/script_objecttype.cpp
+++ b/src/script/api/script_objecttype.cpp
@@ -19,7 +19,7 @@
 
 /* static */ bool ScriptObjectType::IsValidObjectType(ObjectType object_type)
 {
-	if (object_type >= NUM_OBJECTS) return false;
+	if (object_type >= ObjectSpec::Count()) return false;
 	return ObjectSpec::Get(object_type)->IsEverAvailable();
 }
 
diff --git a/src/script/api/script_objecttypelist.cpp b/src/script/api/script_objecttypelist.cpp
index 0086260b20..0bb52b0576 100644
--- a/src/script/api/script_objecttypelist.cpp
+++ b/src/script/api/script_objecttypelist.cpp
@@ -15,7 +15,7 @@
 
 ScriptObjectTypeList::ScriptObjectTypeList()
 {
-	for (int i = 0; i < NUM_OBJECTS; i++) {
+	for (int i = 0; i < ObjectSpec::Count(); i++) {
 		const ObjectSpec *spec = ObjectSpec::Get(i);
 		if (!spec->IsEverAvailable()) continue;
 		this->AddItem(i);