diff --git a/src/clientiface.cpp b/src/clientiface.cpp
index c2d245f67..f76ef0a88 100644
--- a/src/clientiface.cpp
+++ b/src/clientiface.cpp
@@ -480,12 +480,11 @@ void RemoteClient::SetBlockNotSent(v3s16 p)
 		m_blocks_modified.insert(p);
 }
 
-void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
+void RemoteClient::SetBlocksNotSent(const std::vector<v3s16> &blocks)
 {
 	m_nothing_to_send_pause_timer = 0;
 
-	for (auto &block : blocks) {
-		v3s16 p = block.first;
+	for (v3s16 p : blocks) {
 		// remove the block from sending and sent sets,
 		// and mark as modified if found
 		if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
@@ -707,12 +706,12 @@ std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 	return reply;
 }
 
-void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
+void ClientInterface::markBlocksNotSent(const std::vector<v3s16> &positions)
 {
 	RecursiveMutexAutoLock clientslock(m_clients_mutex);
 	for (const auto &client : m_clients) {
 		if (client.second->getState() >= CS_Active)
-			client.second->SetBlockNotSent(pos);
+			client.second->SetBlocksNotSent(positions);
 	}
 }
 
diff --git a/src/clientiface.h b/src/clientiface.h
index 1df67b568..c5a93576c 100644
--- a/src/clientiface.h
+++ b/src/clientiface.h
@@ -267,7 +267,7 @@ public:
 	void SentBlock(v3s16 p);
 
 	void SetBlockNotSent(v3s16 p);
-	void SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks);
+	void SetBlocksNotSent(const std::vector<v3s16> &blocks);
 
 	/**
 	 * tell client about this block being modified right now.
@@ -473,8 +473,8 @@ public:
 	/* get list of active client id's */
 	std::vector<session_t> getClientIDs(ClientState min_state=CS_Active);
 
-	/* mark block as not sent to active client sessions */
-	void markBlockposAsNotSent(const v3s16 &pos);
+	/* mark blocks as not sent on all active clients */
+	void markBlocksNotSent(const std::vector<v3s16> &positions);
 
 	/* verify is server user limit was reached */
 	bool isUserLimitReached();
diff --git a/src/server.cpp b/src/server.cpp
index 3437d17f0..26b58245b 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -950,9 +950,7 @@ void Server::AsyncRunStep(float dtime, bool initial_step)
 			}
 			case MEET_OTHER:
 				prof.add("MEET_OTHER", 1);
-				for (const v3s16 &modified_block : event->modified_blocks) {
-					m_clients.markBlockposAsNotSent(modified_block);
-				}
+				m_clients.markBlocksNotSent(event->modified_blocks);
 				break;
 			default:
 				prof.add("unknown", 1);
@@ -964,19 +962,9 @@ void Server::AsyncRunStep(float dtime, bool initial_step)
 			/*
 				Set blocks not sent to far players
 			*/
-			if (!far_players.empty()) {
-				// Convert list format to that wanted by SetBlocksNotSent
-				std::map<v3s16, MapBlock*> modified_blocks2;
-				for (const v3s16 &modified_block : event->modified_blocks) {
-					modified_blocks2[modified_block] =
-							m_env->getMap().getBlockNoCreateNoEx(modified_block);
-				}
-
-				// Set blocks not sent
-				for (const u16 far_player : far_players) {
-					if (RemoteClient *client = getClient(far_player))
-						client->SetBlocksNotSent(modified_blocks2);
-				}
+			for (const u16 far_player : far_players) {
+				if (RemoteClient *client = getClient(far_player))
+					client->SetBlocksNotSent(event->modified_blocks);
 			}
 
 			delete event;