diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2966,7 +2966,7 @@ def forget(ui, repo, *pats, **opts):
     if not pats:
         raise error.InputError(_(b'no files specified'))
 
-    with repo.wlock():
+    with repo.wlock(), repo.dirstate.changing_files(repo):
         m = scmutil.match(repo[None], pats, opts)
         dryrun, interactive = opts.get(b'dry_run'), opts.get(b'interactive')
         uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)