1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/rest/register.py b/synapse/rest/register.py
index 8036c3c406..fe8f0ed23f 100644
--- a/synapse/rest/register.py
+++ b/synapse/rest/register.py
@@ -133,6 +133,7 @@ class RegisterRestServlet(RestServlet):
         logger.debug("Removing session %s", session)
         self.sessions.pop(session["id"])
 
+    @defer.inlineCallbacks
     def _do_recaptcha(self, request, register_json, session):
         if not self.hs.config.enable_registration_captcha:
             raise SynapseError(400, "Captcha not required.")