diff --git a/jedi/inference/compiled/value.py b/jedi/inference/compiled/value.py
index e493750f..c33d89b3 100644
--- a/jedi/inference/compiled/value.py
+++ b/jedi/inference/compiled/value.py
@@ -89,6 +89,7 @@ class CompiledObject(Value):
             return None
         return map(cast_path, paths)
 
+    @property
     def is_package(self):
         return self.py__path__() is not None
 
diff --git a/jedi/inference/context.py b/jedi/inference/context.py
index 227cc927..ad5f89eb 100644
--- a/jedi/inference/context.py
+++ b/jedi/inference/context.py
@@ -302,7 +302,6 @@ class ModuleContext(TreeContextMixin, ValueContext):
     def py__package__(self):
         return self._value.py__package__
 
-    @property
     def is_package(self):
         return self._value.is_package
 
@@ -392,6 +391,13 @@ class CompiledModuleContext(CompiledContext):
     def py__file__(self):
         return self._value.py__file__()
 
+    @property
+    def py__package__(self):
+        return self._value.py__package__
+
+    def is_package(self):
+        return self._value.is_package()
+
 
 def _get_global_filters_for_name(context, name_or_none, position):
     # For functions and classes the defaults don't belong to the
diff --git a/jedi/inference/gradual/typeshed.py b/jedi/inference/gradual/typeshed.py
index f6712c9e..b2af277d 100644
--- a/jedi/inference/gradual/typeshed.py
+++ b/jedi/inference/gradual/typeshed.py
@@ -235,7 +235,7 @@ def _load_from_typeshed(inference_state, python_value_set, parent_module_value,
         map_ = _cache_stub_file_map(inference_state.grammar.version_info)
         import_name = _IMPORT_MAP.get(import_name, import_name)
     elif isinstance(parent_module_value, ModuleValue):
-        if not parent_module_value.is_package:
+        if not parent_module_value.is_package():
             # Only if it's a package (= a folder) something can be
             # imported.
             return None
diff --git a/jedi/inference/names.py b/jedi/inference/names.py
index 0e7f6cee..e336b922 100644
--- a/jedi/inference/names.py
+++ b/jedi/inference/names.py
@@ -93,7 +93,7 @@ class AbstractTreeName(AbstractNameDefinition):
         # In case of level == 1, it works always, because it's like a submodule
         # lookup.
         if import_node is not None and not (import_node.level == 1
-                                            and self.get_root_context().is_package):
+                                            and self.get_root_context().is_package()):
             # TODO improve the situation for when level is present.
             if include_module_names and not import_node.level:
                 return tuple(n.value for n in import_node.get_path_for_name(self.tree_name))
diff --git a/jedi/inference/value/module.py b/jedi/inference/value/module.py
index e89035e6..874dc05d 100644
--- a/jedi/inference/value/module.py
+++ b/jedi/inference/value/module.py
@@ -83,7 +83,7 @@ class SubModuleDictMixin(object):
         package).
         """
         names = {}
-        if self.is_package:
+        if self.is_package():
             mods = iter_module_names(self.inference_state, self.py__path__())
             for name in mods:
                 # It's obviously a relative import to the current module.
@@ -200,7 +200,7 @@ class ModuleValue(ModuleMixin, TreeValue):
             self._path = file_io.path
         self.string_names = string_names  # Optional[Tuple[str, ...]]
         self.code_lines = code_lines
-        self.is_package = is_package
+        self._is_package = is_package
 
     def is_stub(self):
         if self._path is not None and self._path.endswith('.pyi'):
@@ -224,8 +224,11 @@ class ModuleValue(ModuleMixin, TreeValue):
 
         return os.path.abspath(self._path)
 
+    def is_package(self):
+        return self._is_package
+
     def py__package__(self):
-        if self.is_package:
+        if self._is_package:
             return self.string_names
         return self.string_names[:-1]
 
@@ -235,7 +238,7 @@ class ModuleValue(ModuleMixin, TreeValue):
         is a list of paths (strings).
         Returns None if the module is not a package.
         """
-        if not self.is_package:
+        if not self._is_package:
             return None
 
         # A namespace package is typically auto generated and ~10 lines long.
diff --git a/jedi/inference/value/namespace.py b/jedi/inference/value/namespace.py
index 81fc2305..543c1788 100644
--- a/jedi/inference/value/namespace.py
+++ b/jedi/inference/value/namespace.py
@@ -61,7 +61,6 @@ class ImplicitNamespaceValue(Value, SubModuleDictMixin):
     def is_stub(self):
         return False
 
-    @property
     def is_package(self):
         return True
 
diff --git a/test/test_inference/test_imports.py b/test/test_inference/test_imports.py
index 6bab3a6e..17c5a578 100644
--- a/test/test_inference/test_imports.py
+++ b/test/test_inference/test_imports.py
@@ -91,7 +91,7 @@ def test_correct_zip_package_behavior(Script, inference_state, environment, code
     value, = pkg._name.infer()
     assert value.py__file__() == os.path.join(pkg_zip_path, 'pkg', file)
     assert '.'.join(value.py__package__()) == package
-    assert value.is_package is (path is not None)
+    assert value.is_package() is (path is not None)
     if path is not None:
         assert value.py__path__() == [os.path.join(pkg_zip_path, path)]
 
@@ -343,7 +343,7 @@ def test_get_modules_containing_name(inference_state, path, goal, is_package):
 def test_load_module_from_path(inference_state, path, base_names, is_package, names):
     file_io = KnownContentFileIO(path, '')
     m = imports._load_module_from_path(inference_state, file_io, base_names)
-    assert m.is_package == is_package
+    assert m.is_package() == is_package
     assert m.string_names == names