diff --git a/test/test_motor_client.py b/test/test_motor_client.py
index <HASH>..<HASH> 100644
--- a/test/test_motor_client.py
+++ b/test/test_motor_client.py
@@ -170,6 +170,7 @@ class MotorClientTest(MotorTest):
 
         collection = cx.motor_test.test_collection
         insert_collection = cx.motor_test.insert_collection
+        yield insert_collection.remove()
 
         ndocs = [0]
         insert_future = Future()
More reliable test_high_concurrency.