1 files changed, 4 insertions, 2 deletions
diff --git a/src/uri.c b/src/uri.c
index b254bea6..096a45e4 100644
--- a/src/uri.c
+++ b/src/uri.c
@@ -437,8 +437,10 @@ serd_uri_serialise_relative(const SerdURI* uri,
                             SerdSink       sink,
                             void*          stream)
 {
-	size_t     len      = 0;
-	const bool relative = uri_is_under(uri, root ? root : base);
+	size_t     len = 0;
+	const bool relative =
+		root ? uri_is_under(uri, root) : uri_is_related(uri, base);
+
 	if (relative) {
 		len = write_rel_path(sink, stream, uri, base);
 	}