diff --git a/builder.js b/builder.js
index 3c6ddb1..0f5dca7 100644
--- a/builder.js
+++ b/builder.js
@@ -14,7 +14,7 @@ function build() {
   const mountedFiles = new Set();
 
   const result = data.replace(mountRegex, (_match, file) => {
-    let fileContent = fs.readFileSync(path.normalize(file), "utf8");
+    let fileContent = fs.readFileSync(file.replace(/\\/g, "/"), "utf8");
     mountedFiles.add(path.resolve(file));
 
     const inlinePhpVarRegex = /"<<BUILDER_PHP_VAR\((?<varName>.*?)\)>>"/g;