diff --git a/lib/compile/formats.js b/lib/compile/formats.js
index 44895b0b4..7726ee326 100644
--- a/lib/compile/formats.js
+++ b/lib/compile/formats.js
@@ -36,8 +36,8 @@ formats.fast = {
   time: /^(?:[0-2]\d:[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d\d(?::?\d\d)?)?$/i,
   'date-time': /^\d\d\d\d-[0-1]\d-[0-3]\d[t\s](?:[0-2]\d:[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d\d(?::?\d\d)?)$/i,
   // uri: https://github.com/mafintosh/is-my-json-valid/blob/master/formats.js
-  uri: /^(?:[a-z][a-z0-9+-.]*:)(?:\/?\/)?[^\s]*$/i,
-  'uri-reference': /^(?:(?:[a-z][a-z0-9+-.]*:)?\/?\/)?(?:[^\\\s#][^\s#]*)?(?:#[^\\\s]*)?$/i,
+  uri: /^(?:[a-z][a-z0-9+\-.]*:)(?:\/?\/)?[^\s]*$/i,
+  'uri-reference': /^(?:(?:[a-z][a-z0-9+\-.]*:)?\/?\/)?(?:[^\\\s#][^\s#]*)?(?:#[^\\\s]*)?$/i,
   'uri-template': URITEMPLATE,
   url: URL,
   // email (sources from jsen validator):