diff --git a/classification_service/mule.py b/classification_service/mule.py
index 4655595..f637429 100644
--- a/classification_service/mule.py
+++ b/classification_service/mule.py
@@ -70,7 +70,7 @@ def run_classification(task, target_class_name: str):
     results = {
         "tag": task['tag'],
         "model": task['model'],
-        "is_target": class_id == target_id,
+        "is_target": bool(class_id == target_id),
         "probability": probability[target_id]
     }