diff --git a/Doc/conf.py b/Doc/conf.py
index 98e5531585d3f65..89d7fa4c85ab199 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -606,3 +606,14 @@
         '<meta property="og:image:width" content="200">',
         '<meta property="og:image:height" content="200">',
     )
+
+def setup(app):
+    try:
+        import sphinx.builders.changes
+        # We are reaching into the installed library and forcing the
+        # missing key into the class-level typemap.
+        if hasattr(sphinx.builders.changes, 'ChangesBuilder'):
+            if hasattr(sphinx.builders.changes.ChangesBuilder, 'typemap'):
+                sphinx.builders.changes.ChangesBuilder.typemap['soft-deprecated'] = 'soft-deprecated'
+    except ImportError:
+        pass