diff --git a/pkg/encoding/mpv2/userdata.go b/pkg/encoding/mpv2/userdata.go
index fd16bc0..660cc1b 100644
--- a/pkg/encoding/mpv2/userdata.go
+++ b/pkg/encoding/mpv2/userdata.go
@@ -2,7 +2,7 @@ package mpv2
 
 // UserData https://developers.google.com/analytics/devguides/collection/ga4/uid-data
 type UserData struct {
-	SHA256EmailAddress []SHA256Hash      `json:"sha256_email_address,omitempty"`
-	SHA256PhoneNumber  []SHA256Hash      `json:"sha256_phone_number,omitempty"`
-	Address            []UserDataAddress `json:"address,omitempty"`
+	SHA256EmailAddress SHA256Hash      `json:"sha256_email_address,omitempty"`
+	SHA256PhoneNumber  SHA256Hash      `json:"sha256_phone_number,omitempty"`
+	Address            UserDataAddress `json:"address,omitempty"`
 }