diff --git a/commands/out.go b/commands/out.go
index 65e81ac..0ac85b3 100644
--- a/commands/out.go
+++ b/commands/out.go
@@ -63,7 +63,7 @@ func (o *Out) Execute() error {
 
 	src := o.args[1]
 
-	if (req.Source.AwsAccessKeyId != "" && req.Source.AwsSecretAccessKey != "" && req.Source.AwsRegion != "") || (req.Source.AwsRegion != "" && req.Source.AwsUseInstanceRole == true) {
+	if (req.Source.AwsAccessKeyId != "" && req.Source.AwsSecretAccessKey != "" && req.Source.AwsRegion != "") || (req.Source.AwsRegion != "" && req.Source.AwsUseInstanceRole) {
 		if !req.Source.AuthenticateToECR() {
 			return fmt.Errorf("cannot authenticate with ECR")
 		}
diff --git a/types.go b/types.go
index ed4f268..f28b807 100644
--- a/types.go
+++ b/types.go
@@ -62,7 +62,7 @@ type AwsCredentials struct {
 	AWSECRRegistryId   string   `json:"aws_ecr_registry_id,omitempty"`
 	AwsRoleArn         string   `json:"aws_role_arn,omitempty"`
 	AwsRoleArns        []string `json:"aws_role_arns,omitempty"`
-	AwsUseInstanceRole bool     `json:"aws_use_instance_role,omitempty"`
+	AwsUseInstanceRole bool     `json:"aws_use_instance_role"`
 }
 
 type BasicCredentials struct {
@@ -306,7 +306,7 @@ func (source *Source) AuthenticateToECR() bool {
 	}))
 
 	// Override mySession if aws_use_instance_role is set
-	if source.AwsUseInstanceRole == true {
+	if source.AwsUseInstanceRole {
 		mySession = session.Must(session.NewSession(&aws.Config{
 			Region: aws.String(source.AwsRegion)}))
 	}
diff --git a/types_test.go b/types_test.go
index bb0c1c3..2fef1fa 100644
--- a/types_test.go
+++ b/types_test.go
@@ -45,7 +45,7 @@ var _ = Describe("Source", func() {
 		json, err := json.Marshal(source)
 		Expect(err).ToNot(HaveOccurred())
 
-		Expect(json).To(MatchJSON(`{"repository":"foo","insecure":false,"tag":"0"}`))
+		Expect(json).To(MatchJSON(`{"repository":"foo","insecure":false,"tag":"0", "aws_use_instance_role":false}`))
 	})
 
 	Describe("ecr", func() {