diff --git a/packages/webamp/scripts/postcss-optimize-data-uri-pngs.js b/packages/webamp/scripts/postcss-optimize-data-uri-pngs.js
index 94e00d2a..a14abb13 100644
--- a/packages/webamp/scripts/postcss-optimize-data-uri-pngs.js
+++ b/packages/webamp/scripts/postcss-optimize-data-uri-pngs.js
@@ -1,4 +1,3 @@
-const postcss = require("postcss");
 const dataUriToBuffer = require("data-uri-to-buffer");
 const imagemin = require("imagemin");
 const imageminOptipng = require("imagemin-optipng");
@@ -14,24 +13,31 @@ async function optimizeDataUri(dataUri) {
   return `data:image/png;base64,${optimized.toString("base64")}`;
 }
 
-module.exports = postcss.plugin("postcss-optimize-data-uri-pngs", () => {
-  return async function (css) {
-    // walkDecls does not let us work async, so we collect the async work we
-    // need to do here, and await it at the end
-    const promisesFactories = [];
-    css.walkDecls(DATA_URL_PROPS_REGEX, (decl) => {
-      let matches;
-      // WTF JavaScript. This is the worst API for iterating RegEx matches.
-      while ((matches = DATA_URL_REGEX.exec(decl.value))) {
-        const [, dataUri] = matches;
-        promisesFactories.push(async () => {
-          decl.value = decl.value.replace(
-            dataUri,
-            await optimizeDataUri(dataUri)
-          );
-        });
-      }
-    });
-    await Promise.all(promisesFactories.map((p) => p()));
+const plugin = () => {
+  return {
+    postcssPlugin: "postcss-optimize-data-uri-pngs",
+    async Once(css) {
+      // walkDecls does not let us work async, so we collect the async work we
+      // need to do here, and await it at the end
+      const promisesFactories = [];
+      css.walkDecls(DATA_URL_PROPS_REGEX, (decl) => {
+        let matches;
+        // WTF JavaScript. This is the worst API for iterating RegEx matches.
+        while ((matches = DATA_URL_REGEX.exec(decl.value))) {
+          const [, dataUri] = matches;
+          promisesFactories.push(async () => {
+            decl.value = decl.value.replace(
+              dataUri,
+              await optimizeDataUri(dataUri)
+            );
+          });
+        }
+      });
+      await Promise.all(promisesFactories.map((p) => p()));
+    },
   };
-});
+};
+
+plugin.postcss = true;
+
+module.exports = plugin;