diff --git a/tests/instrumentation/kafka_tests.py b/tests/instrumentation/kafka_tests.py
index 54be2ee8e..8339ceefb 100644
--- a/tests/instrumentation/kafka_tests.py
+++ b/tests/instrumentation/kafka_tests.py
@@ -113,6 +113,7 @@ def delayed_send():
         elasticapm_client.begin_transaction("foo")
         producer.send("test", key=b"foo", value=b"bar")
         producer.send("test", key=b"baz", value=b"bazzinga")
+        producer.flush()
         elasticapm_client.end_transaction("foo")
 
     thread = threading.Thread(target=delayed_send)
@@ -139,6 +140,7 @@ def delayed_send():
         elasticapm_client.begin_transaction("foo")
         producer.send("test", key=b"foo", value=b"bar")
         producer.send("test", key=b"baz", value=b"bazzinga")
+        producer.flush()
         elasticapm_client.end_transaction("foo")
 
     thread = threading.Thread(target=delayed_send)
@@ -166,6 +168,7 @@ def delayed_send():
         producer.send(topic="foo", key=b"foo", value=b"bar")
         producer.send("bar", key=b"foo", value=b"bar")
         producer.send("test", key=b"foo", value=b"bar")
+        producer.flush()
 
     thread = threading.Thread(target=delayed_send)
     thread.start()
@@ -186,6 +189,7 @@ def delayed_send():
         producer.send(topic="foo", key=b"foo", value=b"bar")
         producer.send("bar", key=b"foo", value=b"bar")
         producer.send("test", key=b"foo", value=b"bar")
+        producer.flush()
 
     thread = threading.Thread(target=delayed_send)
     thread.start()
@@ -205,6 +209,7 @@ def delayed_send():
         time.sleep(0.2)
         producer.send("test", key=b"foo", value=b"bar")
         producer.send("test", key=b"baz", value=b"bazzinga")
+        producer.flush()
 
     thread = threading.Thread(target=delayed_send)
     thread.start()
@@ -249,6 +254,7 @@ def test_kafka_consumer_unsampled_transaction_handles_stop_iteration(
     def delayed_send():
         time.sleep(0.2)
         producer.send("test", key=b"foo", value=b"bar")
+        producer.flush()
 
     thread = threading.Thread(target=delayed_send)
     thread.start()