diff --git a/README.md b/README.md
index 185fd99..40a21d4 100644
--- a/README.md
+++ b/README.md
@@ -159,6 +159,7 @@ Exit code | Name | Description
 ## Tips for use
 - The PHAR file tries to [mount](https://secure.php.net/manual/en/phar.mount.php) directories outside of the `vendor/` directory and is currently only tested for paths directly one level above the `vendor/` directory. If you rely in some way on paths from outside of the root directory of the project, autoload may not work.
 - I think that the most useful would be to generate autoloading with the option `--classmap-authoritative` for production. To make autoloading from a PHAR file work, I rewrite the generated file indexes, so it may not work for dynamic file guessing and searching.
+- Watch out when using whole archive compression. Although it provides better compression ratio, it also comes with additional hack for decompressing files (overrides custom `stub.php` script) which might break autoloading. Files compression is a bit more reliable here.
 
 ## Plans for future
 - Remove unnecessary whitespaces (a.k.a finish `\Donatorsky\VendorCompress\FileProcessors\StripWhitespacesPhpFileProcessor`)
diff --git a/bin/vendor-compress b/bin/vendor-compress
index a8f42f6..1f1c844 100644
--- a/bin/vendor-compress
+++ b/bin/vendor-compress
@@ -117,7 +117,8 @@ if (!\defined('VENDOR_COMPRESS_COMPOSER_INSTALL')) {
 	exit(VENDOR_COMPRESS_ERR_PROJECT_NOT_SET_UP);
 }
 
-\define('VENDOR_COMPRESS_COMPOSER_PHAR', \dirname(VENDOR_COMPRESS_COMPOSER_INSTALL) . DIRECTORY_SEPARATOR . 'vendor.phar');
+\define('VENDOR_COMPRESS_PROJECT_ROOT', \dirname(VENDOR_COMPRESS_COMPOSER_INSTALL) . DIRECTORY_SEPARATOR);
+\define('VENDOR_COMPRESS_COMPOSER_PHAR', VENDOR_COMPRESS_PROJECT_ROOT . 'vendor.phar');
 
 // Fix user input
 $usingFallbackConfig = false;
@@ -132,6 +133,8 @@ if (null !== $configurationOption) {
 		exit(VENDOR_COMPRESS_ERR_INACCESSIBLE_CONFIGURATION_FILE);
 	}
 } elseif (
+	!\is_file($configurationOption = VENDOR_COMPRESS_PROJECT_ROOT . '.vendor_compress') &&
+	!\is_file($configurationOption = VENDOR_COMPRESS_PROJECT_ROOT . '.vendor_compress.dist') &&
 	!\is_file($configurationOption = \getcwd() . DIRECTORY_SEPARATOR . '.vendor_compress') &&
 	!\is_file($configurationOption = \getcwd() . DIRECTORY_SEPARATOR . '.vendor_compress.dist')
 ) {
diff --git a/composer.json b/composer.json
index 80536f6..4cd8daa 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
 	],
 	"require": {
 		"php": ">=7.1",
+		"ext-Phar": "*",
 		"ext-json": "*"
 	},
 	"require-dev": {