diff --git a/yt_dlp/extractor/radiko.py b/yt_dlp/extractor/radiko.py
index b0b6681c9f..f94d6a3e72 100644
--- a/yt_dlp/extractor/radiko.py
+++ b/yt_dlp/extractor/radiko.py
@@ -7,6 +7,7 @@
 from ..utils import (
     ExtractorError,
     clean_html,
+    join_nonempty,
     time_seconds,
     try_call,
     unified_timestamp,
@@ -167,7 +168,7 @@ def _extract_performers(self, prog):
 
 
 class RadikoIE(RadikoBaseIE):
-    _VALID_URL = r'https?://(?:www\.)?radiko\.jp/#!/ts/(?P<station>[A-Z0-9-]+)/(?P<id>\d+)'
+    _VALID_URL = r'https?://(?:www\.)?radiko\.jp/#!/ts/(?P<station>[A-Z0-9-]+)/(?P<timestring>\d+)'
 
     _TESTS = [{
         # QRR (文化放送) station provides <desc>
@@ -183,8 +184,9 @@ class RadikoIE(RadikoBaseIE):
     }]
 
     def _real_extract(self, url):
-        station, video_id = self._match_valid_url(url).groups()
-        vid_int = unified_timestamp(video_id, False)
+        station, timestring = self._match_valid_url(url).group('station', 'timestring')
+        video_id = join_nonempty(station, timestring)
+        vid_int = unified_timestamp(timestring, False)
         prog, station_program, ft, radio_begin, radio_end = self._find_program(video_id, station, vid_int)
 
         auth_token, area_id = self._auth_client()
@@ -207,7 +209,7 @@ def _real_extract(self, url):
                     'ft': radio_begin,
                     'end_at': radio_end,
                     'to': radio_end,
-                    'seek': video_id,
+                    'seek': timestring,
                 },
             ),
         }