diff --git a/lib/svgo/coa.js b/lib/svgo/coa.js
index 63fcb74f7..de7e17a96 100644
--- a/lib/svgo/coa.js
+++ b/lib/svgo/coa.js
@@ -8,7 +8,7 @@ const { loadConfig, optimize } = require('../svgo-node.js');
 const pluginsMap = require('../../plugins/plugins.js');
 const PKG = require('../../package.json');
 const { encodeSVGDatauri, decodeSVGDatauri } = require('./tools.js');
-const regSVGFile = /\.svg$/;
+const regSVGFile = /\.svg$/i;
 const noop = () => {};
 
 /**