diff --git a/lib/openid/trustroot.rb b/lib/openid/trustroot.rb
index 28c56292..80daec3d 100644
--- a/lib/openid/trustroot.rb
+++ b/lib/openid/trustroot.rb
@@ -178,7 +178,7 @@ def TrustRoot._parse_url(url)
         end
 
         begin
-          parsed = URI::parse(url)
+          parsed = URI::DEFAULT_PARSER.parse(url)
         rescue URI::InvalidURIError
           return nil
         end