diff --git a/ox/api.py b/ox/api.py
index 042d0be..51742c2 100644
--- a/ox/api.py
+++ b/ox/api.py
@@ -227,6 +227,8 @@ def signin(url):
         url = 'https://%s/api/' % url
     else:
         site = url.split('/')[2]
+    if not url.endswith('/'):
+        url += '/'
     api = API(url)
     update = False
     try: