diff --git a/lychee.toml b/lychee.toml
index 05402cae..ffc7cc66 100644
--- a/lychee.toml
+++ b/lychee.toml
@@ -23,6 +23,9 @@ max_concurrency = 4
 # Comma-separated list of accepted status codes for valid links.
 accept = [200, 429]
 
+# Base URL or website root directory to check relative URLs.
+base = "https://github.com/music-encoding/music-encoding.github.io/tree/gh-pages/"
+
 # Remap URI matching pattern to different URI.
 remap = [
     'file:///home/runner/work/music-encoding.github.io/music-encoding.github.io/archive/ https://github.com/music-encoding/music-encoding.github.io/tree/gh-pages/archive/',