diff --git a/pylxd/client.py b/pylxd/client.py
index c5c5c1eb..236139e1 100644
--- a/pylxd/client.py
+++ b/pylxd/client.py
@@ -482,7 +482,11 @@ def authenticate(self, secret):
         if self.trusted:
             return
         cert = open(self.api.session.cert[0]).read().encode("utf-8")
-        self.certificates.create(secret, cert)
+
+        if self.has_api_extension("explicit_trust_token"):
+            self.certificates.create(secret=secret, cert)
+        else:
+            self.certificates.create(password=secret, cert)
 
         # Refresh the host info
         response = self.api.get()