diff --git a/src/claims.js b/src/claims.js
index 3d1b813..ad31a26 100644
--- a/src/claims.js
+++ b/src/claims.js
@@ -159,7 +159,7 @@ const verify = async (input, fingerprint, opts) => {
   opts = mergeOptions(defaultOpts, opts ? opts : {})
 
   if (!validUrl.isUri(uri)) {
-    throw new Error('Not a valid URI')
+    throw new Error('Invalid URI')
   }
 
   const spMatches = serviceproviders.match(uri, opts)
diff --git a/test/claims.test.js b/test/claims.test.js
index c5b6b19..0f7f2b6 100644
--- a/test/claims.test.js
+++ b/test/claims.test.js
@@ -64,11 +64,11 @@ describe('claims.verify', () => {
   })
   it('should throw an error for non-valid URIs', () => {
     return expect(doipjs.claims.verify('noURI')).to.eventually.be.rejectedWith(
-      'Not a valid URI'
+      'Invalid URI'
     )
     return expect(
       doipjs.claims.verify('domain.org')
-    ).to.eventually.be.rejectedWith('Not a valid URI')
+    ).to.eventually.be.rejectedWith('Invalid URI')
   })
 
   doipjs.serviceproviders.list.forEach((spName, i) => {