diff --git a/signald/client-protocol/v1/types.go b/signald/client-protocol/v1/types.go
index 18929c0..70596d8 100644
--- a/signald/client-protocol/v1/types.go
+++ b/signald/client-protocol/v1/types.go
@@ -2,7 +2,7 @@ package v1
 
 // JsonAddress is a signal user's contact information. a phone number, UUID or both
 type JsonAddress struct {
-	UUID   string `json:"uuid"`
+	UUID   string `json:"uuid,omitempty"`
 	Number string `json:"number"`
 }
 
@@ -26,7 +26,7 @@ type JsonReadMessage struct {
 
 type JsonSendMessageResult struct {
 	Address             JsonAddress `json:"address"`
-	Success             Success      `json:"success"`
+	Success             Success     `json:"success"`
 	NetworkFailure      bool        `json:"networkFailure"`
 	UnregisteredFailure bool        `json:"unregisteredFailure"`
 	IdentityFailure     string      `json:"identityFailure"`