diff --git a/cmd/start.go b/cmd/start.go
index 046b699..36fbc5f 100644
--- a/cmd/start.go
+++ b/cmd/start.go
@@ -23,6 +23,7 @@
 package cmd
 
 import (
+	"fmt"
 	"log"
 	"os"
 	"runtime"
@@ -195,7 +196,7 @@ func runContainer(cmd *cobra.Command, args []string) {
 				if sizeBluestoreBlockToBytes == 0 {
 					log.Fatal("Wrong unit passed: ", getSize(flavor), ". Please refer to https://en.wikipedia.org/wiki/Byte.")
 				}
-				envs = append(envs, "BLUESTORE_BLOCK_SIZE="+string(sizeBluestoreBlockToBytes))
+				envs = append(envs, "BLUESTORE_BLOCK_SIZE="+fmt.Sprint(sizeBluestoreBlockToBytes))
 			}
 		}
 		if testDev == "blockdev" {