diff --git a/src/index.js b/src/index.js
index 9270ab0..ef5f3b9 100644
--- a/src/index.js
+++ b/src/index.js
@@ -297,7 +297,7 @@ export default class Critters {
         rule.selectors = rule.selectors.filter(sel => {
           // Strip pseudo-elements and pseudo-classes, since we only care that their associated elements exist.
           // This means any selector for a pseudo-element or having a pseudo-class will be inlined if the rest of the selector matches.
-          sel = sel.replace(/::?[a-z-]+\s*{/gi, '{').trim();
+          sel = sel.replace(/::?[a-z-]+\s*(\{|$)/gi, '$1').trim();
           try {
             return document.querySelector(sel) != null;
           } catch (e) {