diff --git a/command/command.go b/command/command.go
index e291429e..0e3fad0d 100644
--- a/command/command.go
+++ b/command/command.go
@@ -693,8 +693,8 @@ func buildUA(ver, rev string) string {
 }
 
 // NewMackerelClient returns Mackerel API client for mackerel-agent
-func NewMackerelClient(apibase, apikey, ver, rev string, verbose bool, disableHttpKeepAlive bool) (*mackerel.API, error) {
-	api, err := mackerel.NewAPI(apibase, apikey, verbose, disableHttpKeepAlive)
+func NewMackerelClient(apibase, apikey, ver, rev string, verbose bool, disableHTTPKeepAlive bool) (*mackerel.API, error) {
+	api, err := mackerel.NewAPI(apibase, apikey, verbose, disableHTTPKeepAlive)
 	if err != nil {
 		return nil, err
 	}
@@ -708,7 +708,7 @@ func NewMackerelClient(apibase, apikey, ver, rev string, verbose bool, disableHt
 // Prepare sets up API and registers the host data to the Mackerel server.
 // Use returned values to call Run().
 func Prepare(conf *config.Config, ameta *AgentMeta) (*App, error) {
-	api, err := NewMackerelClient(conf.Apibase, conf.Apikey, ameta.Version, ameta.Revision, conf.Verbose, conf.DisableHttpKeepAlive)
+	api, err := NewMackerelClient(conf.Apibase, conf.Apikey, ameta.Version, ameta.Revision, conf.Verbose, conf.DisableHTTPKeepAlive)
 	if err != nil {
 		return nil, fmt.Errorf("failed to prepare an api: %s", err.Error())
 	}
diff --git a/commands.go b/commands.go
index 069bea95..c41aa351 100644
--- a/commands.go
+++ b/commands.go
@@ -156,7 +156,7 @@ func doRetire(fs *flag.FlagSet, argv []string) error {
 		return fmt.Errorf("hostID file is not found or empty")
 	}
 
-	api, err := command.NewMackerelClient(conf.Apibase, conf.Apikey, version, gitcommit, conf.Verbose, conf.DisableHttpKeepAlive)
+	api, err := command.NewMackerelClient(conf.Apibase, conf.Apikey, version, gitcommit, conf.Verbose, conf.DisableHTTPKeepAlive)
 	if err != nil {
 		return fmt.Errorf("faild to create api client: %s", err)
 	}
diff --git a/config/config.go b/config/config.go
index d1190329..27c85e73 100644
--- a/config/config.go
+++ b/config/config.go
@@ -102,7 +102,7 @@ type Config struct {
 	Verbose              bool
 	Silent               bool
 	Diagnostic           bool          `toml:"diagnostic"`
-	DisableHttpKeepAlive bool          `toml:"disable_http_keep_alive"`
+	DisableHTTPKeepAlive bool          `toml:"disable_http_keep_alive"`
 	DisplayName          string        `toml:"display_name"`
 	HostStatus           HostStatus    `toml:"host_status" conf:"parent"`
 	Disks                Disks         `toml:"disks" conf:"parent"`
@@ -448,8 +448,8 @@ func LoadConfig(conffile string) (*Config, error) {
 	if !config.Diagnostic {
 		config.Diagnostic = DefaultConfig.Diagnostic
 	}
-	if !config.DisableHttpKeepAlive {
-		config.DisableHttpKeepAlive = DefaultConfig.DisableHttpKeepAlive
+	if !config.DisableHTTPKeepAlive {
+		config.DisableHTTPKeepAlive = DefaultConfig.DisableHTTPKeepAlive
 	}
 
 	return config, err
diff --git a/config/config_test.go b/config/config_test.go
index ae0fe6ef..ee3a5795 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -100,7 +100,7 @@ func TestLoadConfig(t *testing.T) {
 		t.Error("should be false (default value should be used)")
 	}
 
-	if config.DisableHttpKeepAlive != false {
+	if config.DisableHTTPKeepAlive != false {
 		t.Error("should be false (default value should be used)")
 	}
 }
diff --git a/mackerel/api.go b/mackerel/api.go
index bb661c3a..c6a4e812 100644
--- a/mackerel/api.go
+++ b/mackerel/api.go
@@ -57,14 +57,14 @@ func infoError(msg string) *InfoError {
 }
 
 // NewAPI creates a new instance of API.
-func NewAPI(rawurl string, apiKey string, verbose bool, disableHttpKeepAlive bool) (*API, error) {
+func NewAPI(rawurl string, apiKey string, verbose bool, disableHTTPKeepAlive bool) (*API, error) {
 	c, err := mkr.NewClientWithOptions(apiKey, rawurl, verbose)
 	if err != nil {
 		return nil, err
 	}
 	c.PrioritizedLogger = logger
 	t := http.DefaultTransport.(*http.Transport).Clone()
-	t.DisableKeepAlives = disableHttpKeepAlive
+	t.DisableKeepAlives = disableHTTPKeepAlive
 	c.HTTPClient.Transport = t
 
 	return &API{Client: c}, nil