diff --git a/Kafka/Producer.php b/Kafka/Producer.php
index 3e1b7918..8ac377a4 100644
--- a/Kafka/Producer.php
+++ b/Kafka/Producer.php
@@ -96,6 +96,9 @@ class Producer extends Component
 
 		$this->setTopicAcks($isAck);
 		$this->push($message, $key);
+		if ($isAck) {
+			$this->flush();
+		}
 	}