diff --git a/csppfetch/__init__.py b/csppfetch/__init__.py
index 60e15297dea1489b48e1e2768e076cc7b16b301e..9f5fba851c3762a560a9fa9190bd0871b7a52edb 100644
--- a/csppfetch/__init__.py
+++ b/csppfetch/__init__.py
@@ -1083,6 +1083,7 @@ class Downloader:
             if ':/' not in u:
                 logging.warning(f"Assuming that {u} (from {envname}) should be file:///{u}")
                 u = "file:///"+u
+            if not u.endswith('/'): u += '/'
             checkedurls.append(u)
         return checkedurls