diff --git a/mautrix_telegram/portal.py b/mautrix_telegram/portal.py
index 5558867a..60e9aff9 100644
--- a/mautrix_telegram/portal.py
+++ b/mautrix_telegram/portal.py
@@ -1774,7 +1774,7 @@ class Portal:
                 return
 
         if sender and not sender.displayname:
-            self.log.debug(f"Telegram user {sender.tgid} sent a message, but doesn't have a"
+            self.log.debug(f"Telegram user {sender.tgid} sent a message, but doesn't have a "
                            "displayname, updating info...")
             entity = await source.client.get_entity(PeerUser(sender.tgid))
             await sender.update_info(source, entity)
diff --git a/mautrix_telegram/puppet.py b/mautrix_telegram/puppet.py
index b715ada0..9cdac8fe 100644
--- a/mautrix_telegram/puppet.py
+++ b/mautrix_telegram/puppet.py
@@ -363,11 +363,13 @@ class Puppet:
                                  ) -> bool:
         if self.disable_updates:
             return False
-        is_main_source = (source.is_relaybot or (self.displayname_source is not None
-                                                 and self.displayname_source == source.tgid))
-        # No phone -> not in contact list -> can't set custom name -> name is trustworthy
-        is_trustworthy_source = isinstance(info, User) and info.phone is None
-        if not is_main_source and not is_trustworthy_source:
+        allow_source = (source.is_relaybot
+                        or self.displayname_source == source.tgid
+                        # No displayname source, so just trust anything
+                        or self.displayname_source is None
+                        # No phone -> not in contact list -> can't set custom name
+                        or (isinstance(info, User) and info.phone is None))
+        if not allow_source:
             return False
         elif isinstance(info, UpdateUserName):
             info = await source.client.get_entity(PeerUser(self.tgid))