diff --git a/packages/flutter_tools/gradle/flutter.gradle b/packages/flutter_tools/gradle/flutter.gradle
index c7b43ef9567..bdea355bf18 100644
--- a/packages/flutter_tools/gradle/flutter.gradle
+++ b/packages/flutter_tools/gradle/flutter.gradle
@@ -745,7 +745,9 @@ abstract class BaseFlutterTask extends DefaultTask {
     File flutterRoot
     File flutterExecutable
     String buildMode
+    @Optional @Input
     String localEngine
+    @Optional @Input
     String localEngineSrcPath
     @Input
     Boolean fastStart