diff --git a/flask_security/utils.py b/flask_security/utils.py
index 679ee61..ea3bffa 100644
--- a/flask_security/utils.py
+++ b/flask_security/utils.py
@@ -212,7 +212,7 @@ def validate_redirect_url(url):
         return False
     url_next = urlsplit(url)
     url_base = urlsplit(request.host_url)
-    if url_next.scheme and url_next.netloc != url_base.netloc:
+    if (url_next.netloc or url_next.scheme) and url_next.netloc != url_base.netloc:
         return False
     return True