diff --git a/critical-css.js b/critical-css.js
index 867f168..82595d9 100755
--- a/critical-css.js
+++ b/critical-css.js
@@ -46,6 +46,7 @@ function findCriticalCss(cssString, url) {
     height: 2160,
     blockJSRequests: false,
     forceExclude: excludeArr,
+    forceInclude: [/^:(\w+)\(/i],
     screenshots: {
       basePath: getScreenshotPath(url),
       type: 'jpeg',