--- a/hgext/gpg.py
+++ b/hgext/gpg.py
@@ -240,7 +240,7 @@ def sign(ui, repo, *revs, **opts):
 
     repo.wfile(".hgsigs", "ab").write(sigmessage)
 
-    if repo.dirstate.state(".hgsigs") == '?':
+    if '.hgsigs' not in repo.dirstate:
         repo.add([".hgsigs"])
 
     if opts["no_commit"]: