diff --git a/sherpa-onnx/python/csrc/offline-lm-config.cc b/sherpa-onnx/python/csrc/offline-lm-config.cc
index ba9ea94d..42edb656 100644
--- a/sherpa-onnx/python/csrc/offline-lm-config.cc
+++ b/sherpa-onnx/python/csrc/offline-lm-config.cc
@@ -15,7 +15,7 @@ void PybindOfflineLMConfig(py::module *m) {
   py::class_<PyClass>(*m, "OfflineLMConfig")
       .def(py::init<const std::string &, float, int32_t, const std::string &>(),
            py::arg("model"), py::arg("scale") = 0.5f,
-           py::arg("lm_num_threads") = 1, py::arg("lm-provider") = "cpu")
+           py::arg("lm_num_threads") = 1, py::arg("lm_provider") = "cpu")
       .def_readwrite("model", &PyClass::model)
       .def_readwrite("scale", &PyClass::scale)
       .def_readwrite("lm_provider", &PyClass::lm_provider)
diff --git a/sherpa-onnx/python/sherpa_onnx/offline_recognizer.py b/sherpa-onnx/python/sherpa_onnx/offline_recognizer.py
index dc1fcdf1..e96271a5 100644
--- a/sherpa-onnx/python/sherpa_onnx/offline_recognizer.py
+++ b/sherpa-onnx/python/sherpa_onnx/offline_recognizer.py
@@ -156,6 +156,8 @@ class OfflineRecognizer(object):
         lm_config = OfflineLMConfig(
             model=lm,
             scale=lm_scale,
+            lm_num_threads=num_threads,
+            lm_provider=provider,
         )
 
         recognizer_config = OfflineRecognizerConfig(