diff --git a/irctest/controllers/limnoria.py b/irctest/controllers/limnoria.py
index 1b096ab..ca01b9e 100644
--- a/irctest/controllers/limnoria.py
+++ b/irctest/controllers/limnoria.py
@@ -23,6 +23,8 @@ class LimnoriaController(BaseClientController, DirectoryBasedController):
             pass
         with self.open_file('conf/users.conf'):
             pass
+        self.supported_sasl_mechanisms = [
+            'PLAIN', 'ECDSA-NIST256P-CHALLENGE', 'EXTERNAL']
 
     def run(self, hostname, port, auth):
         # Runs a client with the config given as arguments
diff --git a/irctest/controllers/sopel.py b/irctest/controllers/sopel.py
index de30383..280d55a 100644
--- a/irctest/controllers/sopel.py
+++ b/irctest/controllers/sopel.py
@@ -22,6 +22,7 @@ class SopelController(BaseClientController):
         super().__init__()
         self.filename = next(tempfile._get_candidate_names()) + '.cfg'
         self.proc = None
+        self.supported_sasl_mechanisms = ['PLAIN']
     def kill(self):
         if self.proc:
             self.proc.kill()