diff --git a/sphinx_js/typedoc.py b/sphinx_js/typedoc.py
index 0041a150..38abf1ea 100644
--- a/sphinx_js/typedoc.py
+++ b/sphinx_js/typedoc.py
@@ -959,14 +959,11 @@ def inner(param: Param) -> Iterator[str | ir.TypeXRef]:
         yield ") => "
         return_type = self.return_type(converter)
         if return_type:
-            ret = return_type[0].type
+            res = return_type[0].type
+            assert isinstance(res, list)
+            yield from res
         else:
-            ret = "void"
-        assert ret
-        if isinstance(ret, str):
-            yield ret
-        else:
-            yield from ret
+            yield ir.TypeXRefIntrinsic("void")
 
     def to_ir(
         self, converter: Converter
@@ -1135,11 +1132,11 @@ class LiteralType(TypeBase):
 
     def _render_name_root(self, converter: Converter) -> Iterator[str | ir.TypeXRef]:
         if self.value is None:
-            yield "null"
+            yield ir.TypeXRefIntrinsic("null")
             return
         # TODO: it could be a bigint or a string?
         if isinstance(self.value, int):
-            yield "number"
+            yield ir.TypeXRefIntrinsic("number")
             return
         yield "<TODO: Unknown type>"
         return
diff --git a/tests/test_typedoc_analysis/test_typedoc_analysis.py b/tests/test_typedoc_analysis/test_typedoc_analysis.py
index 5078353d..9567dd69 100644
--- a/tests/test_typedoc_analysis/test_typedoc_analysis.py
+++ b/tests/test_typedoc_analysis/test_typedoc_analysis.py
@@ -291,7 +291,7 @@ def test_interface_function_member(self):
     def test_variable(self):
         """Make sure top-level consts and vars are found."""
         const = self.analyzer.get_object(["topLevelConst"])
-        assert const.type == ["number"]
+        assert const.type == [TypeXRefIntrinsic("number")]
 
     def test_function(self):
         """Make sure Functions, Params, and Returns are built properly for