diff --git a/README.md b/README.md
index 37800e0..432d874 100644
--- a/README.md
+++ b/README.md
@@ -170,7 +170,7 @@ Example:
 #### `--memory-limit=integer` (optional)
 Sets memory limit for language server.
 Equivalent to [memory-limit](http://php.net/manual/en/ini.core.php#ini.memory-limit) php.ini directive.
-By default there is no memory limit.
+The default is 4GB (which is way more than needed).
 
 Example:
 
diff --git a/bin/php-language-server.php b/bin/php-language-server.php
index 0e3de2a..2a2ab69 100644
--- a/bin/php-language-server.php
+++ b/bin/php-language-server.php
@@ -6,7 +6,7 @@ use Composer\{Factory, XdebugHandler};
 
 $options = getopt('', ['tcp::', 'tcp-server::', 'memory-limit::']);
 
-ini_set('memory_limit', $options['memory-limit'] ?? -1);
+ini_set('memory_limit', $options['memory-limit'] ?? '4G');
 
 foreach ([__DIR__ . '/../../../autoload.php', __DIR__ . '/../autoload.php', __DIR__ . '/../vendor/autoload.php'] as $file) {
     if (file_exists($file)) {