diff --git a/hgext/commitextras.py b/hgext/commitextras.py
--- a/hgext/commitextras.py
+++ b/hgext/commitextras.py
@@ -65,23 +65,23 @@
                         b"unable to parse '%s', should follow "
                         b"KEY=VALUE format"
                     )
-                    raise error.Abort(msg % raw)
+                    raise error.InputError(msg % raw)
                 k, v = raw.split(b'=', 1)
                 if not k:
                     msg = _(b"unable to parse '%s', keys can't be empty")
-                    raise error.Abort(msg % raw)
+                    raise error.InputError(msg % raw)
                 if re.search(br'[^\w-]', k):
                     msg = _(
                         b"keys can only contain ascii letters, digits,"
                         b" '_' and '-'"
                     )
-                    raise error.Abort(msg)
+                    raise error.InputError(msg)
                 if k in usedinternally:
                     msg = _(
                         b"key '%s' is used internally, can't be set "
                         b"manually"
                     )
-                    raise error.Abort(msg % k)
+                    raise error.InputError(msg % k)
                 inneropts['extra'][k] = v
             return super(repoextra, self).commit(*innerpats, **inneropts)
 
diff --git a/tests/test-commit.t b/tests/test-commit.t
--- a/tests/test-commit.t
+++ b/tests/test-commit.t
@@ -134,13 +134,13 @@
   $ hg add quux
   $ hg commit -m "adding internal used extras" --extra amend_source=hash
   abort: key 'amend_source' is used internally, can't be set manually
-  [255]
+  [10]
   $ hg commit -m "special chars in extra" --extra id@phab=214
   abort: keys can only contain ascii letters, digits, '_' and '-'
-  [255]
+  [10]
   $ hg commit -m "empty key" --extra =value
   abort: unable to parse '=value', keys can't be empty
-  [255]
+  [10]
   $ hg commit -m "adding extras" --extra sourcehash=foo --extra oldhash=bar
   $ hg log -r . -T '{extras % "{extra}\n"}'
   branch=default