1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 7406c13fb4..c10733e6da 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -592,7 +592,7 @@ class RegisterRestServlet(RestServlet):
                         desired_display_name = address
                     else:
                         # Custom mapping between email address and display name
-                        desired_display_name = self._map_email_to_displayname(address)
+                        desired_display_name = _map_email_to_displayname(address)
                 elif (
                     self.hs.config.register_mxid_from_3pid == "msisdn"
                     and LoginType.MSISDN in auth_result