diff --git a/abogen/integrations/calibre_opds.py b/abogen/integrations/calibre_opds.py
index 2d264d3..f2ea3f4 100644
--- a/abogen/integrations/calibre_opds.py
+++ b/abogen/integrations/calibre_opds.py
@@ -166,7 +166,12 @@ class CalibreOPDSClient:
         href = href.strip()
         if href.startswith("http://") or href.startswith("https://"):
             return href
-        return urljoin(self._base_url, href)
+        if href.startswith("/") or href.startswith("?") or href.startswith("#"):
+            return urljoin(self._base_url, href)
+        if href.startswith("./") or href.startswith("../"):
+            return urljoin(self._base_url, href)
+        # Ensure relative paths like "search" keep the catalog prefix
+        return urljoin(self._base_url, f"./{href}")
 
     def _open_client(self) -> httpx.Client:
         return httpx.Client(
diff --git a/tests/test_calibre_opds.py b/tests/test_calibre_opds.py
index 06d8e43..edd5975 100644
--- a/tests/test_calibre_opds.py
+++ b/tests/test_calibre_opds.py
@@ -95,3 +95,12 @@ This is the detailed summary text.</summary>
     assert entry.rating_max == 5.0
     assert entry.summary == "This is the detailed summary text."
     assert entry.published == "2024-01-15T00:00:00+00:00"
+
+
+def test_calibre_opds_relative_urls_keep_catalog_prefix() -> None:
+  client = CalibreOPDSClient("http://example.com/opds/")
+
+  assert client._make_url("search") == "http://example.com/opds/search"
+  assert client._make_url("books/sample.epub") == "http://example.com/opds/books/sample.epub"
+  assert client._make_url("/cover/1") == "http://example.com/cover/1"
+  assert client._make_url("?page=2") == "http://example.com/opds/?page=2"