diff --git a/nextcloud.subdomain.conf.sample b/nextcloud.subdomain.conf.sample
index 16c7285..0b21776 100644
--- a/nextcloud.subdomain.conf.sample
+++ b/nextcloud.subdomain.conf.sample
@@ -31,5 +31,6 @@ server {
         proxy_pass $upstream_proto://$upstream_app:$upstream_port;
 
         proxy_max_temp_file_size 2048m;
+        add_header Strict-Transport-Security "max-age=15552000; includeSubDomains; preload;";
     }
 }
diff --git a/nextcloud.subfolder.conf.sample b/nextcloud.subfolder.conf.sample
index ab75158..f6451c5 100644
--- a/nextcloud.subfolder.conf.sample
+++ b/nextcloud.subfolder.conf.sample
@@ -37,4 +37,5 @@ location ^~ /nextcloud/ {
     proxy_set_header If-Range $http_if_range;
     proxy_redirect off;
     proxy_ssl_session_reuse off;
+    add_header Strict-Transport-Security "max-age=15552000; includeSubDomains; preload;";
 }