diff --git a/src/jsproxy.c b/src/jsproxy.c
index 70def0bea..621d86e9f 100644
--- a/src/jsproxy.c
+++ b/src/jsproxy.c
@@ -110,6 +110,12 @@ JsProxy_Call(PyObject* o, PyObject* args, PyObject* kwargs)
     hiwire_decref(idarg);
   }
 
+  if (PyDict_Size(kwargs)) {
+    int idkwargs = python2js(kwargs);
+    hiwire_push_array(idargs, idkwargs);
+    hiwire_decref(idkwargs);
+  }
+
   int idresult = hiwire_call(self->js, idargs);
   hiwire_decref(idargs);
   PyObject* pyresult = js2python(idresult);
diff --git a/test/test_python.py b/test/test_python.py
index a097324a3..017ab4dd4 100644
--- a/test/test_python.py
+++ b/test/test_python.py
@@ -342,6 +342,22 @@ def test_jsproxy_implicit_iter(selenium):
         "list(Object.values(ITER))") == [1, 2, 3]
 
 
+def test_jsproxy_kwargs(selenium):
+    selenium.run_js(
+        """
+        window.kwarg_function = ({ a = 1, b = 1 }) => {
+            return a / b;
+        };
+        """
+    )
+    assert selenium.run(
+        """
+        from js import kwarg_function
+        kwarg_function(b = 2, a = 10)
+        """
+    ) == 5
+
+
 def test_open_url(selenium):
     assert selenium.run(
         """