diff --git a/testserver/docker_mail/templates/mailu.env b/testserver/docker_mail/templates/mailu.env
index 208d611ee04c26ba56a5dddb9dbf4fdf3414e61d..6afd1e6f9d644f6f8d01a529f947aeb398c743b2 100644
--- a/testserver/docker_mail/templates/mailu.env
+++ b/testserver/docker_mail/templates/mailu.env
@@ -179,3 +179,6 @@ DEFAULT_SPAM_THRESHOLD=80
 # API token required for authenticating to the RESTful API.
 # This is a mandatory setting for using the RESTful API.
 API_TOKEN={{ mailu_api_token }}
+
+#Advanced Vector Extensions
+LD_PRELOAD=/usr/lib/libhardened_malloc.so
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