diff --git a/precompile-schemas/index.js b/precompile-schemas/index.js
index 69f356a..7cea498 100644
--- a/precompile-schemas/index.js
+++ b/precompile-schemas/index.js
@@ -131,7 +131,7 @@ const postprocess = async (code) => {
 	// Keep in sync with the `absolutePath` keyword of `schema-utils`, the
 	// pre-compiled schema has to accept exactly what the real one accepts
 	if (/absolutePathRegExp/.test(code))
-		code = `const absolutePathRegExp = /^(?:file:\\/\\/)?(?:[A-Za-z]:[\\\\/]|\\\\\\\\|\\/)/;${code}`;
+		code = `const absolutePathRegExp = /^(?:file:(?=\\/))?(?:[A-Za-z]:[\\\\/]|\\\\\\\\|\\/)/i;${code}`;
 
 	// remove unnecessary error code:
 	code = code