diff --git a/clientapi/auth/authtypes/flow.go b/clientapi/auth/authtypes/flow.go
index 1e5278ed9..f673d2e97 100644
--- a/clientapi/auth/authtypes/flow.go
+++ b/clientapi/auth/authtypes/flow.go
@@ -17,5 +17,5 @@ package authtypes
 // Flow represents one possible way that the client can authenticate a request.
 // https://matrix.org/docs/spec/client_server/r0.3.0.html#user-interactive-authentication-api
 type Flow struct {
-	Stages []LoginType `json:"stages" yaml:"stages`
+	Stages []LoginType `json:"stages" yaml:"stages"`
 }