diff --git a/jedi/inference/compiled/mixed.py b/jedi/inference/compiled/mixed.py
index 695ce068..f435e887 100644
--- a/jedi/inference/compiled/mixed.py
+++ b/jedi/inference/compiled/mixed.py
@@ -292,15 +292,16 @@ def _create(inference_state, access_handle, parent_context, *args):
             # TODO this __name__ is probably wrong.
             name = compiled_object.get_root_context().py__name__()
             string_names = tuple(name.split('.'))
-            module_context = ModuleValue(
+            module_value = ModuleValue(
                 inference_state, module_node,
                 file_io=file_io,
                 string_names=string_names,
                 code_lines=code_lines,
                 is_package=compiled_object.is_package(),
-            ).as_context()
+            )
             if name is not None:
-                inference_state.module_cache.add(string_names, ValueSet([module_context]))
+                inference_state.module_cache.add(string_names, ValueSet([module_value]))
+            module_context = module_value.as_context()
         else:
             if parent_context.tree_node.get_root_node() != module_node:
                 # This happens e.g. when __module__ is wrong, or when using
diff --git a/test/test_inference/test_mixed.py b/test/test_inference/test_mixed.py
index daca6501..cf223899 100644
--- a/test/test_inference/test_mixed.py
+++ b/test/test_inference/test_mixed.py
@@ -5,6 +5,7 @@ if sys.version_info > (3, 5):
 import pytest
 
 import jedi
+from jedi.inference.value import ModuleValue
 
 
 def interpreter(code, namespace, *args, **kwargs):
@@ -40,3 +41,13 @@ def test_generics():
 
     s = StackWrapper()
     print(interpreter('s.stack.pop().', locals()).complete())
+
+
+def test_mixed_module_cache():
+    """Caused by #1479"""
+    interpreter = jedi.Interpreter('jedi', [{'jedi': jedi}])
+    d, = interpreter.infer()
+    assert d.name == 'jedi'
+    inference_state = interpreter._inference_state
+    jedi_module, = inference_state.module_cache.get(('jedi',))
+    assert isinstance(jedi_module, ModuleValue)