diff --git a/CHANGES.md b/CHANGES.md
index 327cdc8c4f..96f8388508 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,11 +1,16 @@
 ## Version 11.2.0 (pending)
 
+Build:
+
+- fix: run Node build CSS files thru CSS processor also (#3284) [Josh Goebel][]
+
 Parser:
 
 - fix(types) Fix some type definition issues (#3274) [Josh Goebel][]
 
 [Josh Goebel]: https://github.com/joshgoebel
 
+
 ## Version 11.1.0
 
 Grammars:
diff --git a/tools/build_node.js b/tools/build_node.js
index 235061a4fe..6e8117e664 100644
--- a/tools/build_node.js
+++ b/tools/build_node.js
@@ -3,7 +3,7 @@ const fss = require("fs");
 const config = require("./build_config");
 const glob = require("glob-promise");
 const { getLanguages } = require("./lib/language");
-const { install, mkdir } = require("./lib/makestuff");
+const { install, mkdir, installCleanCSS } = require("./lib/makestuff");
 const { filter } = require("./lib/dependencies");
 const { rollupWrite } = require("./lib/bundling.js");
 const log = (...args) => console.log(...args);
@@ -163,8 +163,13 @@ async function buildNode(options) {
     const stat = fss.statSync(`./src/styles/${file}`);
     if (stat.isDirectory()) return;
 
-    install(`./src/styles/${file}`, `styles/${file}`);
-    install(`./src/styles/${file}`, `scss/${file.replace(".css", ".scss")}`);
+    if (file.endsWith(".css")) {
+      installCleanCSS(`./src/styles/${file}`, `styles/${file}`);
+      installCleanCSS(`./src/styles/${file}`, `scss/${file.replace(".css", ".scss")}`);
+    } else {
+      // images, etc.
+      install(`./src/styles/${file}`, `styles/${file}`);
+    }
   });
 
   let languages = await getLanguages();