diff --git a/src/proxy.c b/src/proxy.c
index 4754624ec..4e14e2fe0 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -221,6 +221,7 @@ void free_proxy(struct proxy *p)
 	istfree(&p->server_id_hdr_name);
 	ha_free(&p->check_command);
 	ha_free(&p->check_path);
+	ha_free(&p->dyncookie_key);
 	free(p->rdp_cookie_name);
 	free_email_alert(p);
 	free(p->invalid_rep);