diff --git a/CHANGES b/CHANGES
index b860e53ed..144ac28a7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -33,6 +33,7 @@ Bugs fixed
 * #5091: latex: curly braces in index entries are not handled correctly
 * #5070: epub: Wrong internal href fragment links
 * #5104: apidoc: Interface of ``sphinx.apidoc:main()`` has changed
+* #5125: sphinx-build: Interface of ``sphinx:main()`` has changed
 
 Testing
 --------
diff --git a/sphinx/__init__.py b/sphinx/__init__.py
index c81166603..34bd365bc 100644
--- a/sphinx/__init__.py
+++ b/sphinx/__init__.py
@@ -60,15 +60,15 @@ if __version__.endswith('+'):
         pass
 
 
-def main(*args, **kwargs):
+def main(argv=sys.argv):
     from .cmd import build
     warnings.warn(
         '`sphinx.main()` has moved to `sphinx.cmd.build.main()`.',
         RemovedInSphinx20Warning,
         stacklevel=2,
     )
-    args = args[1:]  # skip first argument to adjust arguments (refs: #4615)
-    return build.main(*args, **kwargs)
+    argv = argv[1:]  # skip first argument to adjust arguments (refs: #4615)
+    return build.main(argv)
 
 
 def build_main(argv=sys.argv):