diff --git a/tinywiki/utils.py b/tinywiki/utils.py
index f745989..7ea44a6 100644
--- a/tinywiki/utils.py
+++ b/tinywiki/utils.py
@@ -98,7 +98,7 @@ def import_builtin_pages_from_zip(zip: str | Path, user=None):
 
     if not zip.exists():
         raise ValueError(f"File \"{zip}\" does not exist!")
-    if not zip.isfile():
+    if not zip.is_file():
         raise ValueError("zip needs to be a valid file!")
     if not zipfile.is_zipfile(zip):
         raise ValueError("zip needs to be a zip file!")