diff --git a/internal/util/session.go b/internal/util/session.go
index 911c486..26808d4 100644
--- a/internal/util/session.go
+++ b/internal/util/session.go
@@ -90,7 +90,7 @@ func (t *APITokenProvider) IsExpired() bool {
 
 type APITokenValue struct {
 	AccessKeyID     string `json:"accessKeyId"`
-	SecretAccessKey string
-	SessionToken    string
-	Expiration      int64
+	SecretAccessKey string `json:"secretAccessKey"`
+	SessionToken    string `json:"sessionToken"`
+	Expiration      int64 `json:"expireTime"`
 }
diff --git a/internal/util/util.go b/internal/util/util.go
index 98498d6..f12e142 100644
--- a/internal/util/util.go
+++ b/internal/util/util.go
@@ -35,6 +35,7 @@ func New(config *configs.Root, configFile string, observation *observ.Observatio
 	if err != nil {
 		log.Fatalf("Failed to initialize AWS Session: %s", err)
 	}
+	awsSession.Config.Region = config.Region
 
 	var apiClient APIer
 	if config.API.Host != nil && config.API.BasePath != nil {