diff --git a/images.go b/images.go
index c60e3212f..7a26f803d 100644
--- a/images.go
+++ b/images.go
@@ -43,7 +43,7 @@ type ImageCreateOptions struct {
 	DiskID      int    `json:"disk_id"`
 	Label       string `json:"label"`
 	Description string `json:"description,omitempty"`
-	CloudInit   bool   `json:"cloud_init"`
+	CloudInit   bool   `json:"cloud_init,omitempty"`
 }
 
 // ImageUpdateOptions fields are those accepted by UpdateImage
@@ -63,7 +63,7 @@ type ImageCreateUploadOptions struct {
 	Region      string `json:"region"`
 	Label       string `json:"label"`
 	Description string `json:"description,omitempty"`
-	CloudInit   bool   `json:"cloud_init"`
+	CloudInit   bool   `json:"cloud_init,omitempty"`
 }
 
 // ImageUploadOptions fields are those accepted by UploadImage
diff --git a/instances.go b/instances.go
index 74b341931..bcc5148fd 100644
--- a/instances.go
+++ b/instances.go
@@ -100,7 +100,7 @@ type InstanceTransfer struct {
 // that relate to the Linode Metadata service.
 type InstanceMetadataOptions struct {
 	// UserData expects a Base64-encoded string
-	UserData string `json:"user_data"`
+	UserData string `json:"user_data,omitempty"`
 }
 
 // InstanceCreateOptions require only Region and Type