diff --git a/slixmpp_omemo/__init__.py b/slixmpp_omemo/__init__.py
index a89a829..42c0812 100644
--- a/slixmpp_omemo/__init__.py
+++ b/slixmpp_omemo/__init__.py
@@ -767,7 +767,7 @@ class XEP_0384(BasePlugin):
                     encrypted = await self._omemo().encryptMessage(
                         barejids,
                         plaintext.encode('utf-8'),
-                        self.bundles,
+                        bundles=self.bundles,
                         expect_problems=expect_problems,
                     )
                 elif _ignore_trust:
@@ -780,7 +780,7 @@ class XEP_0384(BasePlugin):
                 else:
                     encrypted = await self._omemo().encryptKeyTransportMessage(
                         barejids,
-                        self.bundles,
+                        bundles=self.bundles,
                         expect_problems=expect_problems,
                     )
                 return _generate_encrypted_payload(encrypted)