diff --git a/pyleco/json_utils/rpc_server.py b/pyleco/json_utils/rpc_server.py
index 1d035626..b1e83e62 100644
--- a/pyleco/json_utils/rpc_server.py
+++ b/pyleco/json_utils/rpc_server.py
@@ -25,4 +25,4 @@
 try:
     from openrpc import RPCServer  # type: ignore  # noqa: F401
 except ModuleNotFoundError:
-    from .rpc_server_definition import RPCServer  # noqa: F401
+    from .rpc_server_definition import RPCServer  # type: ignore  # noqa: F401
diff --git a/tests/json_utils/test_rpc_server.py b/tests/json_utils/test_rpc_server.py
index 060da28a..376be035 100644
--- a/tests/json_utils/test_rpc_server.py
+++ b/tests/json_utils/test_rpc_server.py
@@ -37,7 +37,7 @@
 except ModuleNotFoundError:
     rpc_server_classes = [RPCServer]
 else:
-    rpc_server_classes = [RPCServer, RPCServerOpen]
+    rpc_server_classes: list = [RPCServer, RPCServerOpen]
 
 
 @pytest.fixture