diff --git a/src/borg/helpers/parseformat.py b/src/borg/helpers/parseformat.py
index 171e1462dc..3d70317571 100644
--- a/src/borg/helpers/parseformat.py
+++ b/src/borg/helpers/parseformat.py
@@ -616,9 +616,10 @@ def canonical_path(self):
                 path = "/./" + self.path  # /./x = path x relative to cwd
             else:
                 path = self.path
-            return "ssh://{}{}{}{}".format(
+            return "{}://{}{}{}{}".format(
+                self.proto if self.proto else "???",
                 f"{self.user}@" if self.user else "",
-                self._host,  # needed for ipv6 addrs
+                self._host if self._host else "",  # needed for ipv6 addrs
                 f":{self.port}" if self.port else "",
                 path,
             )