diff --git a/miner/src/lib.rs b/miner/src/lib.rs
index a431bd44e..d6310eb8a 100644
--- a/miner/src/lib.rs
+++ b/miner/src/lib.rs
@@ -92,7 +92,7 @@ pub trait MinerService : Send + Sync {
 	fn chain_new_blocks(&self, chain: &BlockChainClient, imported: &[H256], invalid: &[H256], enacted: &[H256], retracted: &[H256]);
 
 	/// New chain head event. Restart mining operation.
-	fn prepare_sealing(&self, chain: &BlockChainClient);
+	fn update_sealing(&self, chain: &BlockChainClient);
 
 	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
 	fn sealing_block(&self, chain: &BlockChainClient) -> &Mutex<Option<ClosedBlock>>;
diff --git a/miner/src/miner.rs b/miner/src/miner.rs
index 6d5b3086e..d177d81ee 100644
--- a/miner/src/miner.rs
+++ b/miner/src/miner.rs
@@ -93,13 +93,28 @@ impl Miner {
 	pub fn set_minimal_gas_price(&self, min_gas_price: U256) {
 		self.transaction_queue.lock().unwrap().set_minimal_gas_price(min_gas_price);
 	}
+
+	/// Prepares new block for sealing including top transactions from queue.
+	pub fn prepare_sealing(&self, chain: &BlockChainClient) {
+		let no_of_transactions = 128;
+		// TODO: should select transactions orm queue according to gas limit of block.
+		let transactions = self.transaction_queue.lock().unwrap().top_transactions(no_of_transactions);
+
+		let b = chain.prepare_sealing(
+			self.author(),
+			self.gas_floor_target(),
+			self.extra_data(),
+			transactions,
+		);
+		*self.sealing_block.lock().unwrap() = b;
+	}
 }
 
 impl MinerService for Miner {
 
 	fn clear_and_reset(&self, chain: &BlockChainClient) {
 		self.transaction_queue.lock().unwrap().clear();
-		self.prepare_sealing(chain);
+		self.update_sealing(chain);
 	}
 
 	fn status(&self) -> MinerStatus {
@@ -121,18 +136,10 @@ impl MinerService for Miner {
 		transaction_queue.pending_hashes()
 	}
 
-	fn prepare_sealing(&self, chain: &BlockChainClient) {
-		let no_of_transactions = 128;
-		// TODO: should select transactions orm queue according to gas limit of block.
-		let transactions = self.transaction_queue.lock().unwrap().top_transactions(no_of_transactions);
-
-		let b = chain.prepare_sealing(
-			self.author(),
-			self.gas_floor_target(),
-			self.extra_data(),
-			transactions,
-		);
-		*self.sealing_block.lock().unwrap() = b;
+	fn update_sealing(&self, chain: &BlockChainClient) {
+		if self.sealing_enabled.load(atomic::Ordering::Relaxed) {
+			self.prepare_sealing(chain);
+		}
 	}
 
 	fn sealing_block(&self, chain: &BlockChainClient) -> &Mutex<Option<ClosedBlock>> {
@@ -199,8 +206,6 @@ impl MinerService for Miner {
 			});
 		}
 
-		if self.sealing_enabled.load(atomic::Ordering::Relaxed) {
-			self.prepare_sealing(chain);
-		}
+		self.update_sealing(chain);
 	}
 }
diff --git a/rpc/src/v1/tests/helpers/miner_service.rs b/rpc/src/v1/tests/helpers/miner_service.rs
index 3a60bd136..9f38b374b 100644
--- a/rpc/src/v1/tests/helpers/miner_service.rs
+++ b/rpc/src/v1/tests/helpers/miner_service.rs
@@ -54,7 +54,7 @@ impl MinerService for TestMinerService {
 	fn chain_new_blocks(&self, _chain: &BlockChainClient, _imported: &[H256], _invalid: &[H256], _enacted: &[H256], _retracted: &[H256]) { unimplemented!(); }
 
 	/// New chain head event. Restart mining operation.
-	fn prepare_sealing(&self, _chain: &BlockChainClient) { unimplemented!(); }
+	fn update_sealing(&self, _chain: &BlockChainClient) { unimplemented!(); }
 
 	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
 	fn sealing_block(&self, _chain: &BlockChainClient) -> &Mutex<Option<ClosedBlock>> {
diff --git a/sync/src/chain.rs b/sync/src/chain.rs
index 4f6c2100a..c87dc9535 100644
--- a/sync/src/chain.rs
+++ b/sync/src/chain.rs
@@ -403,7 +403,7 @@ impl ChainSync {
 							self.remove_downloaded_blocks(number + 1);
 						}
 						if self.have_common_block && number < self.current_base_block() + 1 {
-							// unkown header 
+							// unkown header
 							debug!(target: "sync", "Old block header {:?} ({}) is unknown, restarting sync", hash, number);
 							self.restart(io);
 							return Ok(());
@@ -947,7 +947,10 @@ impl ChainSync {
 		}
 		let chain = io.chain();
 		let fetch_nonce = |a: &Address| chain.nonce(a);
-		let _ = self.miner.import_transactions(transactions, fetch_nonce);
+		let res = self.miner.import_transactions(transactions, fetch_nonce);
+		if res.is_ok() {
+			self.miner.update_sealing(io.chain());
+		}
  		Ok(())
 	}
 
@@ -1287,7 +1290,7 @@ impl ChainSync {
 	}
 
 	pub fn chain_new_head(&mut self, io: &mut SyncIo) {
-		self.miner.prepare_sealing(io.chain());
+		self.miner.update_sealing(io.chain());
 	}
 }