diff --git a/index.js b/index.js
index 53b1195..cb068b8 100644
--- a/index.js
+++ b/index.js
@@ -30,6 +30,8 @@ const loop = (cb) => {
   };
 };
 
+const escapeRegExp = string => string.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&').replace(/-/g, '\\x2d');
+
 module.exports = (options_ = {}) => {
   const options = {...DEFAULTS, ...options_};
 
@@ -49,7 +51,6 @@ module.exports = (options_ = {}) => {
       );
 
       const mapping = await getDataUriMapping([...urls], options);
-      const {default: escapeRegExp} = await import('escape-string-regexp');
 
       root.walkDecls(
         filter,
diff --git a/package.json b/package.json
index 546646f..54e56e8 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,6 @@
   "dependencies": {
     "asset-resolver": "^3.0.5",
     "debug": "^4.3.4",
-    "escape-string-regexp": "^5.0.0",
     "filesize": "^9.0.11",
     "svgo": "^2.8.0"
   },