diff --git a/packages/material-ui-icons/builder.js b/packages/material-ui-icons/builder.js
index b596c6ca153f7d..54044d5051f2de 100755
--- a/packages/material-ui-icons/builder.js
+++ b/packages/material-ui-icons/builder.js
@@ -119,9 +119,10 @@ async function worker({ svgPath, options, renameFilter, template }) {
.replace(//g, '');
const result = await svgo.optimize(input);
+
// Extract the paths from the svg string
// Clean xml paths
- const paths = result.data
+ let paths = result.data
.replace(/