diff --git a/inc/cache.php b/inc/cache.php
index fe508610..ff15a0ab 100644
--- a/inc/cache.php
+++ b/inc/cache.php
@@ -12,7 +12,6 @@ defined('TINYBOARD') or exit;
 class Cache {
 	private static function buildCache(): CacheDriver {
 		global $config;
-		$isDocker = is_file("/.dockerenv") || is_file("/run/.containerenv");
 
 		switch ($config['cache']['enabled']) {
 			case 'memcached':
@@ -26,7 +25,7 @@ class Cache {
 				$password = $config['cache']['redis'][2] ?? '';
 				$database = $config['cache']['redis'][3] ?? 1;
 
-				if ($isDocker) {
+				if ($config['is_docker']) {
 					$host = getenv('VICHAN_REDIS_HOST') ?: $host;
 					$port = getenv('VICHAN_REDIS_PORT') ?: $port;
 					$password = getenv('VICHAN_REDIS_PASSWORD') ?: $password;
diff --git a/inc/config.php b/inc/config.php
index 8341a072..5b488baa 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -1859,7 +1859,7 @@
  */
 
  $isDocker = is_file("/.dockerenv") || is_file("/run/.containerenv");
- $config['docker'] = $isDocker;
+ $config['is_docker'] = $isDocker;
 	
 /*
  * ====================