--- a/mercurial/util.py	Mon Jul 31 16:04:44 2017 -0700
+++ b/mercurial/util.py	Mon Jul 31 16:44:17 2017 -0700
@@ -2890,7 +2890,8 @@
     Raises an error.Abort when the url is unsafe.
     """
     path = urlreq.unquote(path)
-    if path.startswith('ssh://-') or '|' in path:
+    if (path.startswith('ssh://-') or path.startswith('svn+ssh://-')
+        or '|' in path):
         raise error.Abort(_('potentially unsafe url: %r') %
                           (path,))