diff --git a/Text/HTML/SanitizeXSS.hs b/Text/HTML/SanitizeXSS.hs
--- a/Text/HTML/SanitizeXSS.hs
+++ b/Text/HTML/SanitizeXSS.hs
@@ -76,7 +76,8 @@
 sanitaryURI :: String -> Bool
 sanitaryURI u =
   case parseURIReference (escapeURI u) of
-     Just p  -> (init (map toLower $ uriScheme p)) `member` safeURISchemes
+     Just p  -> (null (uriScheme p)) ||
+                ((map toLower $ init $ uriScheme p) `member` safeURISchemes)
      Nothing -> False
 
 
diff --git a/xss-sanitize.cabal b/xss-sanitize.cabal
--- a/xss-sanitize.cabal
+++ b/xss-sanitize.cabal
@@ -1,5 +1,5 @@
 name:            xss-sanitize
-version:         0.2.3
+version:         0.2.4
 license:         BSD3
 license-file:    LICENSE
 author:          Greg Weber <greg@gregweber.info>