diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index eac4151bba6..2b616ee1014 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -341,7 +341,7 @@ always available.
    if the object type does not provide means to retrieve the size and would
    cause a `TypeError`.
 
-   func:`getsizeof` calls the object's __sizeof__ method and adds an additional
+   :func:`getsizeof` calls the object's __sizeof__ method and adds an additional
    garbage collector overhead if the object is managed by the garbage collector.