diff --git a/tools/tex-to-svg.js b/tools/tex-to-svg.js
index e682cd1d..f42936e0 100644
--- a/tools/tex-to-svg.js
+++ b/tools/tex-to-svg.js
@@ -67,7 +67,7 @@ var filedata = [
   '\\usepackage{unicode-math}'
 ]
 
-if (process.env.locale === 'zh-CN') {
+if (process.env.LOCALE === 'zh-CN') {
   filedata = filedata.concat([
     '\\usepackage{xeCJK}',
     '\\xeCJKsetup{CJKmath=true}',
@@ -75,7 +75,7 @@ if (process.env.locale === 'zh-CN') {
   ]);
 }
 
-if (process.env.locale === 'ja-JP') {
+if (process.env.LOCALE === 'ja-JP') {
   filedata = filedata.concat([
     '\\usepackage{xeCJK}',
     '\\xeCJKsetup{CJKmath=true}',
diff --git a/webpack.config.js b/webpack.config.js
index 2779db4f..d6a29485 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -3,7 +3,7 @@ var path = require('path');
 var fs = require('fs');
 
 const defaultLocale = "en-GB";
-var locale = process.env.locale || defaultLocale;
+var locale = process.env.LOCALE || defaultLocale;
 
 console.log("Using locale: "+locale);