diff --git a/Containers/mastercontainer/start.sh b/Containers/mastercontainer/start.sh
index c0c37af2..e48a24ca 100644
--- a/Containers/mastercontainer/start.sh
+++ b/Containers/mastercontainer/start.sh
@@ -304,8 +304,8 @@ E.g. https://internal.ip.of.this.server:8080
 If your server has port 80 and 8443 open and you point a domain to your server, you can get a valid certificate automatically by opening the Nextcloud AIO Interface via:
 https://your-domain-that-points-to-this-server.tld:8443"
 
-# Set the timezone to UTC
-export TZ=UTC
+# Set the timezone to Etc/UTC
+export TZ=Etc/UTC
 
 # Fix apache startup
 rm -f /var/run/apache2/httpd.pid
diff --git a/php/src/Docker/DockerActionManager.php b/php/src/Docker/DockerActionManager.php
index 91359846..ef2a972b 100644
--- a/php/src/Docker/DockerActionManager.php
+++ b/php/src/Docker/DockerActionManager.php
@@ -317,7 +317,7 @@ class DockerActionManager
                     }
                 } elseif ($out[1] === 'TIMEZONE') {
                     if ($this->configurationManager->GetTimezone() === '') {
-                        $replacements[1] = 'UTC';
+                        $replacements[1] = 'Etc/UTC';
                     } else {
                         $replacements[1] = $this->configurationManager->GetTimezone();
                     }