diff --git a/src/Symfony/Component/Debug/ErrorHandler.php b/src/Symfony/Component/Debug/ErrorHandler.php
index fd22f201adef6..99791f9aad9f3 100644
--- a/src/Symfony/Component/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/Debug/ErrorHandler.php
@@ -119,7 +119,7 @@ class ErrorHandler
     public static function register(self $handler = null, $replace = true)
     {
         if (null === self::$reservedMemory) {
-            self::$reservedMemory = str_repeat('x', 10240);
+            self::$reservedMemory = str_repeat('x', 32768);
             register_shutdown_function(__CLASS__.'::handleFatalError');
         }
 
diff --git a/src/Symfony/Component/ErrorHandler/ErrorHandler.php b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
index 4c4d7dc361cb9..9e523fd4c11f4 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorHandler.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
@@ -111,7 +111,7 @@ class ErrorHandler
     public static function register(self $handler = null, bool $replace = true): self
     {
         if (null === self::$reservedMemory) {
-            self::$reservedMemory = str_repeat('x', 10240);
+            self::$reservedMemory = str_repeat('x', 32768);
             register_shutdown_function(__CLASS__.'::handleFatalError');
         }