diff --git a/convert.py b/convert.py
index ca6da4b..6377a6a 100644
--- a/convert.py
+++ b/convert.py
@@ -22,8 +22,10 @@ from web import Web
 logger = logging.getLogger(__name__)
 
 SOURCES = frozenset((
-    ActivityPub,
-    Web,
+    ActivityPub.ABBREV,
+    ActivityPub.LABEL,
+    Web.ABBREV,
+    Web.LABEL,
 ))
 DESTS = frozenset((
     ActivityPub.ABBREV,
@@ -94,3 +96,13 @@ def render_redirect():
     """Redirect from old /render?id=... endpoint to /convert/..."""
     id = flask_util.get_required_param('id')
     return redirect(ActivityPub.subdomain_url(f'/convert/web/{id}'), code=301)
+
+
+@app.get(f'/convert/<any({",".join(SOURCES)}):src>/<any({",".join(DESTS)}):dest>/<path:_>')
+def convert_source_path_redirect(src, dest, _):
+    """Old route that included source protocol in path instead of subdomain."""
+    if Protocol.for_request() not in (None, 'web'):  # no per-protocol subdomains
+        error(f'Try again on fed.brid.gy', status=404)
+
+    new_path = request.full_path.replace(f'/{src}/', '/')
+    return redirect(PROTOCOLS[src].subdomain_url(new_path), code=301)
diff --git a/tests/test_convert.py b/tests/test_convert.py
index 112d8f1..461c769 100644
--- a/tests/test_convert.py
+++ b/tests/test_convert.py
@@ -225,6 +225,12 @@ A ☕ reply
         self.assertEqual(f'https://ap.brid.gy/convert/web/http://foo?bar',
                          resp.headers['Location'])
 
+    def test_convert_source_path_redirect(self):
+        resp = self.client.get('/convert/ap/web/http://foo?bar')
+        self.assertEqual(301, resp.status_code)
+        self.assertEqual(f'https://ap.brid.gy/convert/web/http://foo?bar',
+                         resp.headers['Location'])
+
     def test_web_to_activitypub_object(self):
         url = 'https://user.com/bar?baz=baj&biff'
         self.make_user('user.com')