1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 3fafe594c5..92b596f672 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -817,6 +817,10 @@ class NonCallableMock(Base):
             if child is None or isinstance(child, _SpecState):
                 break
             else:
+                # If an autospecced object is attached using attach_mock the
+                # child would be a function with mock object as attribute from
+                # which signature has to be derived.
+                child = _extract_mock(child)
                 children = child._mock_children
                 sig = child._spec_signature