diff --git a/thermion_dart/hook/build.dart b/thermion_dart/hook/build.dart
index b39046aa..b6a93d78 100644
--- a/thermion_dart/hook/build.dart
+++ b/thermion_dart/hook/build.dart
@@ -232,7 +232,7 @@ void main(List<String> args) async {
         }
 
         var ndkRoot =
-            File(compilerPath).parent.parent.uri.toFilePath(windows: true);
+            File(compilerPath).parent.parent.uri.toFilePath(windows: Platform.isWindows);
 
         var stlPath = File([
           ndkRoot,