diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index f92d1a97..0c6c20ce 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -431,6 +431,9 @@ class ImplicitTuple(_FakeArray):
 
 class FakeSequence(_FakeArray):
     def __init__(self, evaluator, sequence_values, type):
+        """
+        type should be one of "tuple", "list"
+        """
         super(FakeSequence, self).__init__(evaluator, sequence_values, type)
         self._sequence_values = sequence_values
 
diff --git a/jedi/evaluate/pep0484.py b/jedi/evaluate/pep0484.py
index 8b4381ff..56efcd67 100644
--- a/jedi/evaluate/pep0484.py
+++ b/jedi/evaluate/pep0484.py
@@ -132,8 +132,7 @@ def get_types_for_typing_module(evaluator, typ, node):
     compiled_classname = compiled.create(evaluator, typ.name.value)
 
     result = set()
-    # don't know what the last parameter is for, this seems to work :)
-    args = FakeSequence(evaluator, nodes, "x-type")
+    args = FakeSequence(evaluator, nodes, "tuple")
 
     result |= evaluator.execute_evaluated(factory, compiled_classname, args)
     human_nodes = []