diff --git a/src/index.js b/src/index.js
index 3bef0c86..68463c59 100644
--- a/src/index.js
+++ b/src/index.js
@@ -365,7 +365,7 @@ module.exports = (
         map = undefined;
       }
       code =
-        `if (process.pkg) {\n` +
+        `if (process.pkg || require('process').platform === 'win32') {\n` +
           `module.exports=require('./${filename}.cache.js');\n` +
         `} else {\n` +
           `const { readFileSync, writeFileSync } = require('fs'), { Script } = require('vm'), { wrap } = require('module');\n` +
diff --git a/src/sourcemap-register.js b/src/sourcemap-register.js
deleted file mode 100644
index ae3f42c1..00000000
--- a/src/sourcemap-register.js
+++ /dev/null
@@ -1,3 +0,0 @@
-// note: this file is overriden by `scripts/build`
-// and substituted for the production release
-module.exports = require("source-map-support/register");