diff --git a/phpBB/config/services.yml b/phpBB/config/services.yml
index b9c71844dc..6b7b3f2f2b 100644
--- a/phpBB/config/services.yml
+++ b/phpBB/config/services.yml
@@ -242,6 +242,7 @@ services:
         arguments:
             - @ext.manager
             - @style.path_provider
+            - %core.root_path%
 
     style.path_provider:
         class: phpbb_style_path_provider
diff --git a/phpBB/includes/bbcode.php b/phpBB/includes/bbcode.php
index e8681420d4..c198abeb54 100644
--- a/phpBB/includes/bbcode.php
+++ b/phpBB/includes/bbcode.php
@@ -133,7 +133,7 @@ class bbcode
 			$this->template_bitfield = new bitfield($user->style['bbcode_bitfield']);
 
 			$style_resource_locator = new phpbb_style_resource_locator();
-			$style_path_provider = new phpbb_style_extension_path_provider($phpbb_extension_manager, new phpbb_style_path_provider());
+			$style_path_provider = new phpbb_style_extension_path_provider($phpbb_extension_manager, new phpbb_style_path_provider(), $phpbb_root_path);
 			$template = new phpbb_template($phpbb_root_path, $phpEx, $config, $user, $style_resource_locator, new phpbb_template_context(), $phpbb_extension_manager);
 			$style = new phpbb_style($phpbb_root_path, $phpEx, $config, $user, $style_resource_locator, $style_path_provider, $template);
 			$style->set_style();
diff --git a/phpBB/includes/functions_messenger.php b/phpBB/includes/functions_messenger.php
index 821f0d970d..e580f6b675 100644
--- a/phpBB/includes/functions_messenger.php
+++ b/phpBB/includes/functions_messenger.php
@@ -209,7 +209,7 @@ class messenger
 		if (!isset($this->tpl_msg[$template_lang . $template_file]))
 		{
 			$style_resource_locator = new phpbb_style_resource_locator();
-			$style_path_provider = new phpbb_style_extension_path_provider($phpbb_extension_manager, new phpbb_style_path_provider());
+			$style_path_provider = new phpbb_style_extension_path_provider($phpbb_extension_manager, new phpbb_style_path_provider(), $phpbb_root_path);
 			$tpl = new phpbb_template($phpbb_root_path, $phpEx, $config, $user, $style_resource_locator, new phpbb_template_context(), $phpbb_extension_manager);
 			$style = new phpbb_style($phpbb_root_path, $phpEx, $config, $user, $style_resource_locator, $style_path_provider, $tpl);
 
diff --git a/phpBB/includes/style/extension_path_provider.php b/phpBB/includes/style/extension_path_provider.php
index 6976a45ed0..e658abcb42 100644
--- a/phpBB/includes/style/extension_path_provider.php
+++ b/phpBB/includes/style/extension_path_provider.php
@@ -40,17 +40,22 @@ class phpbb_style_extension_path_provider extends phpbb_extension_provider imple
 	*/
 	protected $base_path_provider;
 
+	/** @var string */
+	protected $phpbb_root_path;
+
 	/**
 	* Constructor stores extension manager
 	*
 	* @param phpbb_extension_manager $extension_manager phpBB extension manager
 	* @param phpbb_style_path_provider $base_path_provider A simple path provider
 	*            to provide paths to be located in extensions
+	* @param string		$phpbb_root_path	phpBB root path
 	*/
-	public function __construct(phpbb_extension_manager $extension_manager, phpbb_style_path_provider $base_path_provider)
+	public function __construct(phpbb_extension_manager $extension_manager, phpbb_style_path_provider $base_path_provider, $phpbb_root_path)
 	{
 		parent::__construct($extension_manager);
 		$this->base_path_provider = $base_path_provider;
+		$this->phpbb_root_path = $phpbb_root_path;
 	}
 
 	/**
@@ -91,6 +96,14 @@ class phpbb_style_extension_path_provider extends phpbb_extension_provider imple
 					$directories['style'][] = $path;
 					if ($path && !phpbb_is_absolute($path))
 					{
+						// Remove phpBB root path from the style path,
+						// so the finder is able to find extension styles,
+						// when the root path is not ./
+						if (strpos($path, $this->phpbb_root_path) === 0)
+						{
+							$path = substr($path, strlen($this->phpbb_root_path));
+						}
+
 						$result = $finder->directory('/' . $this->ext_dir_prefix . $path)
 							->get_directories(true, false, true);
 						foreach ($result as $ext => $ext_path)