diff --git a/lib/core/utilities.js b/lib/core/utilities.js
index 52e0430ad..7c098981d 100644
--- a/lib/core/utilities.js
+++ b/lib/core/utilities.js
@@ -4,7 +4,7 @@ export const isSet = o => !isUnset(o)
 export const isSameURL = (a, b) => a.split('?')[0] === b.split('?')[0]
 
 export const isRelativeURL = u =>
-  u && u.length && /^\/[a-zA-Z0-9@\-%_~][/a-zA-Z0-9@\-%_~]*[?]?([^#]*)#?([^#]*)$/.test(u)
+  u && u.length && /^\/([a-zA-Z0-9@\-%_~][/a-zA-Z0-9@\-%_~]*)?([?][^#]*)?(#[^#]*)?$/.test(u)
 
 export const parseQuery = queryString => {
   const query = {}