diff --git a/phpBB/includes/cache/driver/file.php b/phpBB/includes/cache/driver/file.php
index b20c0064ea..32bdb1918a 100644
--- a/phpBB/includes/cache/driver/file.php
+++ b/phpBB/includes/cache/driver/file.php
@@ -214,7 +214,7 @@ class phpbb_cache_driver_file extends phpbb_cache_driver_base
 
 		while (($entry = readdir($dir)) !== false)
 		{
-			if (strpos($entry, 'container') !== 0 &&
+			if (strpos($entry, 'container_') !== 0 &&
 				strpos($entry, 'sql_') !== 0 &&
 				strpos($entry, 'data_') !== 0 &&
 				strpos($entry, 'ctpl_') !== 0 &&
diff --git a/phpBB/includes/cache/driver/memory.php b/phpBB/includes/cache/driver/memory.php
index 98ac02b161..1ea9a3e9e7 100644
--- a/phpBB/includes/cache/driver/memory.php
+++ b/phpBB/includes/cache/driver/memory.php
@@ -162,7 +162,7 @@ abstract class phpbb_cache_driver_memory extends phpbb_cache_driver_base
 
 		while (($entry = readdir($dir)) !== false)
 		{
-			if (strpos($entry, 'container') !== 0 &&
+			if (strpos($entry, 'container_') !== 0 &&
 				strpos($entry, 'sql_') !== 0 &&
 				strpos($entry, 'data_') !== 0 &&
 				strpos($entry, 'ctpl_') !== 0 &&
diff --git a/phpBB/includes/functions_container.php b/phpBB/includes/functions_container.php
index 843207db84..8014574443 100644
--- a/phpBB/includes/functions_container.php
+++ b/phpBB/includes/functions_container.php
@@ -138,5 +138,5 @@ function phpbb_create_dumped_container_unless_debug(array $extensions, array $pa
 function phpbb_container_filename($phpbb_root_path, $php_ext)
 {
 	$filename = str_replace(array('/', '.'), array('slash', 'dot'), $phpbb_root_path);
-	return $phpbb_root_path . 'cache/' . $filename . '_container.' . $php_ext;
+	return $phpbb_root_path . 'cache/container_' . $filename . '.' . $php_ext;
 }