diff --git a/jedi/evaluate/param.py b/jedi/evaluate/param.py
index b019e535..64711a19 100644
--- a/jedi/evaluate/param.py
+++ b/jedi/evaluate/param.py
@@ -46,7 +46,7 @@ def _get_calling_var_args(evaluator, var_args):
             names = evaluator.goto(argument, [exp_list[1].get_code()])
             if len(names) != 1:
                 break
-            param = names[0].parent
+            param = names[0].get_definition()
             if not isinstance(param, ExecutedParam):
                 if isinstance(param, pr.Param):
                     # There is no calling var_args in this case - there's just
diff --git a/test/test_api/test_api.py b/test/test_api/test_api.py
index 7890b8c5..0e5c0ac7 100644
--- a/test/test_api/test_api.py
+++ b/test/test_api/test_api.py
@@ -130,5 +130,5 @@ def test_goto_definition_not_multiple():
 
 
 def test_usage_description():
-    for u in api.Script('foo = ''; foo').usages():
-        assert u.description == 'foo'
+    descs = [u.description for u in api.Script("foo = ''; foo").usages()]
+    assert set(descs) == {"foo = ''", 'foo'}