diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
index 17bb8508ae..abc8bbe6f0 100644
--- a/tests/test-bdrv-drain.c
+++ b/tests/test-bdrv-drain.c
@@ -948,6 +948,7 @@ static void coroutine_fn test_co_delete_by_drain(void *opaque)
     }
 
     dbdd->done = true;
+    g_free(buffer);
 }
 
 /**