diff --git a/content/style-injector.js b/content/style-injector.js
index d870ae63..b2a48b4e 100644
--- a/content/style-injector.js
+++ b/content/style-injector.js
@@ -158,7 +158,7 @@ window.StyleInjector = window.INJECTED === 1 ? window.StyleInjector : ({
   function setTextAndName(el, {id, code = '', name}) {
     if (exposeStyleName && name) {
       el.dataset.name = name;
-      name = encodeURIComponent(name.replace(/[?#%/@:']/g, toSafeChar));
+      name = encodeURIComponent(name.replace(/[?#/']/g, toSafeChar));
       code += `\n/*# sourceURL=${chrome.runtime.getURL(name)}.user.css#${id} */`;
     }
     el.textContent = code;