diff --git a/cli/smartcontract/smart_contract.go b/cli/smartcontract/smart_contract.go
index 4cd604e59..be9b1cbd9 100644
--- a/cli/smartcontract/smart_contract.go
+++ b/cli/smartcontract/smart_contract.go
@@ -18,8 +18,8 @@ import (
 )
 
 var (
-	errNoInput             = errors.New("No input file was found, specify an input file with the '--in or -i' flag")
-	errNoSmartContractName = errors.New("No name was provided, specify the '--name or -n' flag")
+	errNoInput             = errors.New("no input file was found, specify an input file with the '--in or -i' flag")
+	errNoSmartContractName = errors.New("no name was provided, specify the '--name or -n' flag")
 	errFileExist           = errors.New("A file with given smart-contract name already exists")
 )
 
diff --git a/pkg/util/fixed8.go b/pkg/util/fixed8.go
index 1364a0601..f28f74e45 100644
--- a/pkg/util/fixed8.go
+++ b/pkg/util/fixed8.go
@@ -12,7 +12,7 @@ const (
 	decimals  = 100000000
 )
 
-var errInvalidString = errors.New("Fixed8 must satisfy following regex \\d+(\\.\\d{1,8})?")
+var errInvalidString = errors.New("fixed8 must satisfy following regex \\d+(\\.\\d{1,8})?")
 
 // Fixed8 represents a fixed-point number with precision 10^-8.
 type Fixed8 int64
diff --git a/pkg/vm/cli/cli.go b/pkg/vm/cli/cli.go
index f871db287..d5f4461f4 100644
--- a/pkg/vm/cli/cli.go
+++ b/pkg/vm/cli/cli.go
@@ -213,7 +213,7 @@ func handleBreak(c *ishell.Context) {
 	}
 	v := getVMFromContext(c)
 	if len(c.Args) != 1 {
-		c.Err(errors.New("Missing parameter <ip>"))
+		c.Err(errors.New("missing parameter <ip>"))
 	}
 	n, err := strconv.Atoi(c.Args[0])
 	if err != nil {
diff --git a/pkg/vm/compiler/compiler.go b/pkg/vm/compiler/compiler.go
index 94bf31ee8..1bb1cc9b8 100644
--- a/pkg/vm/compiler/compiler.go
+++ b/pkg/vm/compiler/compiler.go
@@ -87,7 +87,7 @@ func CompileAndSave(src string, o *Options) error {
 	}
 	b, err = Compile(bytes.NewReader(b), o)
 	if err != nil {
-		return fmt.Errorf("Error while trying to compile smart contract file: %v", err)
+		return fmt.Errorf("error while trying to compile smart contract file: %v", err)
 	}
 
 	log.Println(hex.EncodeToString(b))