diff --git a/stdlib/3/abc.pyi b/stdlib/3/abc.pyi
index 675f0b162..1e3275653 100644
--- a/stdlib/3/abc.pyi
+++ b/stdlib/3/abc.pyi
@@ -3,3 +3,4 @@
 # Thesee definitions have special processing in type checker.
 class ABCMeta: ...
 abstractmethod = object()
+abstractproperty = object()