diff --git a/src/regexValues/iri.ts b/src/regexValues/iri.ts
index 43a42f8c..3b6cfb50 100644
--- a/src/regexValues/iri.ts
+++ b/src/regexValues/iri.ts
@@ -1,7 +1,7 @@
 import { checkRegex, Rule } from 'rulr';
 import { createTypeWarning } from '../warnings/TypeWarning';
 
-const regex = /^\w+:\/\//i;
+const regex = /^\w+:/i;
 const warningConstructor = createTypeWarning('Internationalized Resource Identifier (IRI)');
 
 export default checkRegex(regex, warningConstructor) as Rule;
diff --git a/src/tests/regexValues/iri.ts b/src/tests/regexValues/iri.ts
index 9c825e9b..d4faf276 100644
--- a/src/tests/regexValues/iri.ts
+++ b/src/tests/regexValues/iri.ts
@@ -28,4 +28,8 @@ export default (test: Test) => {
   // Tests from the conformance suite.
   itsInvalid('ab=c://should.fail.com', 'not an IRI', test);
   itsInvalid('not.a.valid.iri.com/verb', 'not an IRI', test);
+
+  // LL-472
+  itsValid('urn:071b8229-c909-5d6f-b250-8cbb6f36fda7:Test:Test_0', test);
+  itsValid('urn:uuid:a4942cbb-aabf-526f-8f69-379f265416b5', test);
 };