diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index 94c32ae7c..5d689557d 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1809,12 +1809,14 @@ class UninitializedGlobalVariableMixin(DataDocumenterMixinBase):
         except ImportError as exc:
             # annotation only instance variable (PEP-526)
             try:
-                parent = importlib.import_module(self.modname)
-                annotations = get_type_hints(parent, None, self.config.autodoc_type_aliases)
-                if self.objpath[-1] in annotations:
-                    self.object = UNINITIALIZED_ATTR
-                    self.parent = parent
-                    return True
+                with mock(self.config.autodoc_mock_imports):
+                    parent = importlib.import_module(self.modname)
+                    annotations = get_type_hints(parent, None,
+                                                 self.config.autodoc_type_aliases)
+                    if self.objpath[-1] in annotations:
+                        self.object = UNINITIALIZED_ATTR
+                        self.parent = parent
+                        return True
             except ImportError:
                 pass