diff --git a/sphinx/deprecation.py b/sphinx/deprecation.py
index 9ea4ab1f3..5d3cb7ffa 100644
--- a/sphinx/deprecation.py
+++ b/sphinx/deprecation.py
@@ -10,10 +10,6 @@
 """
 
 
-class RemovedInSphinx16Warning(DeprecationWarning):
-    pass
-
-
 class RemovedInSphinx17Warning(DeprecationWarning):
     pass