diff --git a/source/common/world/Chunk.hpp b/source/common/world/Chunk.hpp
index e30205d86..573f920e6 100644
--- a/source/common/world/Chunk.hpp
+++ b/source/common/world/Chunk.hpp
@@ -64,8 +64,8 @@ class Chunk : public gk::NonCopyable {
 
 		void setBlockRaw(int x, int y, int z, u16 block);
 
-		virtual void onBlockPlaced(int, int, int, const Block &) const {}
-		virtual void onBlockDestroyed(int, int, int, const Block &) const {}
+		virtual void onBlockPlaced(int, int, int, const Block &) {}
+		virtual void onBlockDestroyed(int, int, int, const Block &) {}
 
 		BlockData *getBlockData(int x, int y, int z) const;
 		BlockData *addBlockData(int x, int y, int z, int inventoryWidth = 0, int inventoryHeight = 0);
diff --git a/source/server/world/ServerChunk.cpp b/source/server/world/ServerChunk.cpp
index b5988cb8f..7bda3287d 100644
--- a/source/server/world/ServerChunk.cpp
+++ b/source/server/world/ServerChunk.cpp
@@ -37,14 +37,18 @@ void ServerChunk::updateLights() {
 	}
 }
 
-void ServerChunk::onBlockPlaced(int x, int y, int z, const Block &block) const {
+void ServerChunk::onBlockPlaced(int x, int y, int z, const Block &block) {
 	const ServerBlock &serverBlock = (ServerBlock &)block;
 	serverBlock.onBlockPlaced(glm::ivec3{x + m_x * CHUNK_WIDTH, y + m_y * CHUNK_DEPTH, z + m_z * CHUNK_HEIGHT}, m_world);
+
+	m_hasBeenModified = true;
 }
 
-void ServerChunk::onBlockDestroyed(int x, int y, int z, const Block &block) const {
+void ServerChunk::onBlockDestroyed(int x, int y, int z, const Block &block) {
 	const ServerBlock &serverBlock = (ServerBlock &)block;
 	serverBlock.onBlockDestroyed(glm::ivec3{x + m_x * CHUNK_WIDTH, y + m_y * CHUNK_DEPTH, z + m_z * CHUNK_HEIGHT}, m_world);
+
+	m_hasBeenModified = true;
 }
 
 void ServerChunk::tick(World &world, ServerCommandHandler &server) {
diff --git a/source/server/world/ServerChunk.hpp b/source/server/world/ServerChunk.hpp
index 614f17bc3..4e242fbe4 100644
--- a/source/server/world/ServerChunk.hpp
+++ b/source/server/world/ServerChunk.hpp
@@ -42,16 +42,19 @@ class ServerChunk : public Chunk {
 
 		void updateLights();
 
-		void onBlockPlaced(int x, int y, int z, const Block &block) const;
-		void onBlockDestroyed(int x, int y, int z, const Block &block) const;
+		void onBlockPlaced(int x, int y, int z, const Block &block) override;
+		void onBlockDestroyed(int x, int y, int z, const Block &block) override;
 
 		void tick(World &world, ServerCommandHandler &server);
 
 		bool isSent() const { return m_isSent; }
 		void setSent(bool isSent) { m_isSent = isSent; }
 
+		bool hasBeenModified() const { return m_hasBeenModified; }
+
 	private:
 		std::atomic_bool m_isSent{false};
+		std::atomic_bool m_hasBeenModified{false};
 };
 
 #endif // SERVERCHUNK_HPP_
diff --git a/source/server/world/WorldController.cpp b/source/server/world/WorldController.cpp
index e62252577..900d597b9 100644
--- a/source/server/world/WorldController.cpp
+++ b/source/server/world/WorldController.cpp
@@ -110,18 +110,18 @@ void WorldController::save(const std::string &name) {
 	for (auto &world : m_worldList) {
 		Network::Packet chunks;
 		unsigned int chunkCount = 0;
-		for (auto &chunk : world.chunks()) {
-			if (!chunk.second->isInitialized()) continue;
+		for (auto &it : world.chunks()) {
+			if (!it.second->isInitialized() || !it.second->hasBeenModified()) continue;
 
-			const gk::Vector3i &chunkpos = chunk.first;
-			const Chunk::DataArray &data = chunk.second->data();
+			const gk::Vector3i &chunkpos = it.first;
+			const Chunk::DataArray &data = it.second->data();
 			chunks << chunkpos.x << chunkpos.y << chunkpos.z;
 
 			for (u8 z = 0 ; z < Chunk::height ; ++z) {
 				for (u8 y = 0 ; y < Chunk::depth ; ++y) {
 					for (u8 x = 0 ; x < Chunk::width ; ++x) {
 						chunks << u32(data[z][y][x])
-							<< u8(chunk.second->lightmap().getLightData(x, y, z));
+							<< u8(it.second->lightmap().getLightData(x, y, z));
 					}
 				}
 			}