diff --git a/conservancy_beancount/rtutil.py b/conservancy_beancount/rtutil.py
index 509631a..a0173ba 100644
--- a/conservancy_beancount/rtutil.py
+++ b/conservancy_beancount/rtutil.py
@@ -16,6 +16,7 @@
 
 import functools
 import mimetypes
+import os
 import re
 import sqlite3
 import urllib.parse as urlparse
@@ -73,7 +74,7 @@ class RTLinkCache(_LinkCache):
     @classmethod
     def setup(cls, cache_path: Path) -> Optional[sqlite3.Connection]:
         try:
-            db = sqlite3.connect(cache_path, isolation_level=None)
+            db = sqlite3.connect(os.fspath(cache_path), isolation_level=None)
             cursor = db.cursor()
             cursor.execute(cls.CREATE_TABLE_SQL)
             cursor.execute('SELECT url FROM RTLinkCache LIMIT 1')