diff --git a/src/DI/Compiler.php b/src/DI/Compiler.php
index c4ecfc2dc..1eb6a4fca 100644
--- a/src/DI/Compiler.php
+++ b/src/DI/Compiler.php
@@ -217,7 +217,11 @@ public function compile(): string
 	/** @internal */
 	public function processExtensions(): void
 	{
-		$first = $this->getExtensions(Extensions\ParametersExtension::class) + $this->getExtensions(Extensions\ExtensionsExtension::class);
+		$extensionsExtensionName = Nette\DI\Extensions\ExtensionsExtension::class;
+		if (array_key_exists('extensions', $this->extensions)) {
+			$extensionsExtensionName = get_class($this->extensions['extensions']);
+		}
+		$first = $this->getExtensions(Extensions\ParametersExtension::class) + $this->getExtensions($extensionsExtensionName);
 		foreach ($first as $name => $extension) {
 			$config = $this->processSchema($extension->getConfigSchema(), $this->configs[$name] ?? [], $name);
 			$extension->setConfig($this->config[$name] = $config);
diff --git a/tests/DI/ExtensionsExtension.basic.phpt b/tests/DI/ExtensionsExtension.basic.phpt
index ee5409fb6..16183b0b8 100644
--- a/tests/DI/ExtensionsExtension.basic.phpt
+++ b/tests/DI/ExtensionsExtension.basic.phpt
@@ -51,6 +51,13 @@ class FirstExtension extends DI\CompilerExtension
 	}
 }
 
+class CustomExtensionsExtension extends DI\CompilerExtension
+{
+	public function loadConfiguration()
+	{
+		$this->compiler->addExtension('first', new FirstExtension);
+	}
+}
 
 $compiler = new DI\Compiler;
 $compiler->addExtension('first', new FirstExtension);
@@ -67,7 +74,11 @@ foo:
 	key: value
 ');
 
-
 Assert::same('hello', $container->parameters['foo']);
 Assert::same('test', $container->parameters['bar']);
 Assert::same(['services', 'parameters', 'first', 'extensions', 'foo', 'bar'], $container->parameters['first']);
+
+$compiler = new DI\Compiler;
+$compiler->addExtension('extensions', new CustomExtensionsExtension);
+$container = createContainer($compiler);
+Assert::same(['services', 'parameters', 'extensions', 'first'], $container->parameters['first']);