diff --git a/libraries/shared/watcher/storage_watcher.go b/libraries/shared/watcher/storage_watcher.go
index 0ad8a54a..813d7aa7 100644
--- a/libraries/shared/watcher/storage_watcher.go
+++ b/libraries/shared/watcher/storage_watcher.go
@@ -18,7 +18,6 @@ package watcher
 
 import (
 	"fmt"
-	"strconv"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -124,7 +123,7 @@ func (storageWatcher StorageWatcher) processRow(diff utils.StorageDiff) {
 		}
 		return
 	}
-	logrus.Debug("Storage diff persisted at block height: " + strconv.Itoa(diff.BlockHeight))
+	logrus.Debugf("Storage diff persisted at block height: %d", diff.BlockHeight)
 }
 
 func (storageWatcher StorageWatcher) processQueue() {
diff --git a/pkg/eth/blockchain.go b/pkg/eth/blockchain.go
index f15a607c..da88b191 100644
--- a/pkg/eth/blockchain.go
+++ b/pkg/eth/blockchain.go
@@ -60,7 +60,7 @@ func NewBlockChain(ethClient core.EthClient, rpcClient core.RPCClient, node core
 
 func (blockChain *BlockChain) GetBlockByNumber(blockNumber int64) (block core.Block, err error) {
 	gethBlock, err := blockChain.ethClient.BlockByNumber(context.Background(), big.NewInt(blockNumber))
-	logrus.Debug("GetBlockByNumber called with block " + strconv.Itoa(int(blockNumber)))
+	logrus.Debugf("GetBlockByNumber called with block %d", blockNumber)
 	if err != nil {
 		return block, err
 	}
@@ -77,7 +77,7 @@ func (blockChain *BlockChain) GetEthLogsWithCustomQuery(query ethereum.FilterQue
 }
 
 func (blockChain *BlockChain) GetHeaderByNumber(blockNumber int64) (header core.Header, err error) {
-	logrus.Debug("GetHeaderByNumber called with block " + strconv.Itoa(int(blockNumber)))
+	logrus.Debugf("GetHeaderByNumber called with block %d", blockNumber)
 	if blockChain.node.NetworkID == core.KOVAN_NETWORK_ID {
 		return blockChain.getPOAHeader(blockNumber)
 	}