diff --git a/lib/src/nstack_builder.dart b/lib/src/nstack_builder.dart
index d03db9b..20610e2 100644
--- a/lib/src/nstack_builder.dart
+++ b/lib/src/nstack_builder.dart
@@ -16,6 +16,9 @@ class NstackBuilder implements Builder {
 
   @override
   FutureOr<void> build(BuildStep buildStep) async {
+    if (!buildStep.inputId.toString().contains('nstack.json')) {
+      return;
+    }
     /// Read the input source and parse it as JSON.
     final AssetId outputId = buildStep.inputId.changeExtension('.dart');
     final StringBuffer output = StringBuffer();
diff --git a/pubspec.yaml b/pubspec.yaml
index e4abd3a..fcb11b5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: nstack
 description: Nstack plugin for Flutter.
-version: 0.2.0
+version: 0.2.1
 author: Nodes Agency
 homepage: https://github.com/nstack-io/flutter-sdk