diff --git a/plinth/modules/letsencrypt/__init__.py b/plinth/modules/letsencrypt/__init__.py
index 0c802bf66..c65d504ba 100644
--- a/plinth/modules/letsencrypt/__init__.py
+++ b/plinth/modules/letsencrypt/__init__.py
@@ -29,8 +29,7 @@ from plinth import app as app_module
 from plinth import cfg, menu
 from plinth.errors import ActionError
 from plinth.modules import names
-from plinth.signals import (domain_added, domain_removed, domainname_change,
-                            post_module_loading)
+from plinth.signals import domain_added, domain_removed, post_module_loading
 from plinth.utils import format_lazy
 
 from . import components
@@ -92,7 +91,6 @@ def init():
     app = LetsEncryptApp()
     app.set_enabled(True)
 
-    domainname_change.connect(on_domainname_change)
     domain_added.connect(on_domain_added)
     domain_removed.connect(on_domain_removed)
 
@@ -150,13 +148,6 @@ def certificate_delete(domain):
     components.on_certificate_event('deleted', [domain], None)
 
 
-def on_domainname_change(sender, old_domainname, new_domainname, **kwargs):
-    """Drop the certificate after a domain name change."""
-    del sender  # Unused
-    del new_domainname  # Unused
-    del kwargs  # Unused
-
-
 def on_domain_added(sender, domain_type='', name='', description='',
                     services=None, **kwargs):
     """Obtain a certificate for the new domain"""