diff --git a/lib/latex-loader.js b/lib/latex-loader.js
index 7a79bd7f..e181d216 100644
--- a/lib/latex-loader.js
+++ b/lib/latex-loader.js
@@ -38,7 +38,7 @@ var options = {
 
     // And only generate if the file doesn't already exist, of course.
     if (!fs.existsSync(destination)) {
-      var cmdarg = new Buffer(latex).toString("base64");
+      var cmdarg = Buffer.from(latex).toString("base64");
       var cmd = "npm run latex -- --hash " + hash + " --base64 " + cmdarg;
       console.log(" generating " + hash + ".svg");
       execSync(cmd, { stdio: 'inherit' });