diff --git a/sphinx/deprecation.py b/sphinx/deprecation.py
index 068349d3585..b532b2b384f 100644
--- a/sphinx/deprecation.py
+++ b/sphinx/deprecation.py
@@ -10,6 +10,10 @@ class RemovedInSphinx70Warning(DeprecationWarning):
     pass
 
 
+class RemovedInSphinx80Warning(PendingDeprecationWarning):
+    pass
+
+
 RemovedInNextVersionWarning = RemovedInSphinx70Warning