diff --git a/src/snapshot.ts b/src/snapshot.ts
index 532fe16a..065feb1e 100644
--- a/src/snapshot.ts
+++ b/src/snapshot.ts
@@ -12,7 +12,7 @@ import {
 import { isElement, isShadowRoot } from './utils';
 
 let _id = 1;
-const tagNameRegex = RegExp('[^a-z0-9-_]');
+const tagNameRegex = RegExp('[^a-z0-9-_:]');
 
 export const IGNORED_NODE = -2;