diff --git a/protocols/inspircd.py b/protocols/inspircd.py
index e0b3927..27d6f2d 100644
--- a/protocols/inspircd.py
+++ b/protocols/inspircd.py
@@ -274,8 +274,7 @@ class InspIRCdProtocol(TS6BaseProtocol):
             # It is a client on another server, use CHGIDENT/HOST/NAME.
             if field == 'IDENT':
                 if 'm_chgident.so' not in self._modsupport:
-                    log.warning('(%s) Failed to change ident of %s to %r: load m_chgident.so!', self.name, target, text)
-                    return
+                    raise NotImplementedError('Cannot change idents as m_chgident.so is not loaded')
 
                 self.users[target].ident = text
                 self._send_with_prefix(self.sid, 'CHGIDENT %s %s' % (target, text))
@@ -285,8 +284,7 @@ class InspIRCdProtocol(TS6BaseProtocol):
                                    {'target': target, 'newident': text}])
             elif field == 'HOST':
                 if 'm_chghost.so' not in self._modsupport:
-                    log.warning('(%s) Failed to change host of %s to %r: load m_chghost.so!', self.name, target, text)
-                    return
+                    raise NotImplementedError('Cannot change hosts as m_chghost.so is not loaded')
 
                 self.users[target].host = text
                 self._send_with_prefix(self.sid, 'CHGHOST %s %s' % (target, text))
@@ -296,8 +294,8 @@ class InspIRCdProtocol(TS6BaseProtocol):
 
             elif field in ('REALNAME', 'GECOS'):
                 if 'm_chgname.so' not in self._modsupport:
-                    log.warning('(%s) Failed to change real name of %s to %r: load m_chgname.so!', self.name, target, text)
-                    return
+                    raise NotImplementedError('Cannot change real names as m_chgname.so is not loaded')
+
                 self.users[target].realname = text
                 self._send_with_prefix(self.sid, 'CHGNAME %s :%s' % (target, text))