diff --git a/src/Translator.php b/src/Translator.php
index 31aa71a..969c1b8 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -6,6 +6,7 @@
 use Contributte\Translation\Tracy\Panel;
 use Contributte\Translation\Wrappers\Message;
 use Contributte\Translation\Wrappers\NotTranslate;
+use Generator;
 use Nette\Localization\ITranslator;
 use Nette\Utils\Strings;
 use Nette\Utils\Validators;
@@ -45,6 +46,9 @@ class Translator extends SymfonyTranslator implements ITranslator
 
 	private string $initLang;
 
+	/** @var callable(mixed[] $params): Generator|null */
+	private $translateKeyGenerator = null;
+
 	/**
 	 * @param array<string> $cacheVary
 	 */
@@ -154,6 +158,27 @@ public function addPrefix(
 		return $this;
 	}
 
+	public function getTranslateKeyGenerator(): callable
+	{
+		if ($this->translateKeyGenerator === null) {
+			$this->translateKeyGenerator = function (array $params): Generator {
+				foreach ($params as $k1 => $v1) {
+					yield '%' . $k1 . '%' => $v1;
+				}
+			};
+		}
+
+		return $this->translateKeyGenerator;
+	}
+
+	public function setTranslateKeyGenerator(
+		callable $generator
+	): self
+	{
+		$this->translateKeyGenerator = $generator;
+		return $this;
+	}
+
 	/**
 	 * @throws \Contributte\Translation\Exceptions\InvalidArgument
 	 */
@@ -316,13 +341,9 @@ public function translate(
 			[$domain, $message] = Helpers::extractMessage($message);
 		}
 
-		$tmp = [];
-
-		foreach ($params as $k1 => $v1) {
-			$tmp['%' . $k1 . '%'] = $v1;
-		}
+		$generator = $this->getTranslateKeyGenerator();
 
-		$params = $tmp;
+		$params = iterator_to_array($generator($params));
 
 		if (Validators::isNumeric($count)) {
 			$params += ['%count%' => $count];
diff --git a/tests/Tests/CustomTranslateKeyTest.phpt b/tests/Tests/CustomTranslateKeyTest.phpt
new file mode 100644
index 0000000..c6869c2
--- /dev/null
+++ b/tests/Tests/CustomTranslateKeyTest.phpt
@@ -0,0 +1,45 @@
+<?php declare(strict_types = 1);
+
+namespace Tests;
+
+use Contributte\Translation\FallbackResolver;
+use Contributte\Translation\LocaleResolver;
+use Contributte\Translation\Translator;
+use Contributte\Translation\Wrappers\Message;
+use Generator;
+use Mockery;
+use Nette\DI\Container;
+use Symfony\Component\Translation\Loader\ArrayLoader;
+use Tester\Assert;
+
+$container = require __DIR__ . '/../bootstrap.php';
+
+final class CustomTranslateKeyTest extends TestAbstract
+{
+
+	public function test01(): void
+	{
+		$translations = [
+			'hi' => 'Hi :name!',
+		];
+
+		$translator = new Translator(new LocaleResolver(Mockery::mock(Container::class)), new FallbackResolver(), 'en', $this->container->getParameters()['tempDir'], true);
+		$translator->addLoader('array', new ArrayLoader());
+		$translator->addResource('array', $translations, 'en');
+
+		Assert::same('Hi :name!', $translator->translate('hi', ['name' => 'Ales']));
+		Assert::same('Hi :name!', $translator->translate(new Message('hi', ['name' => 'Ales'])));
+
+		$translator->setTranslateKeyGenerator(function (array $params): Generator {
+			foreach ($params as $k1 => $v1) {
+				yield ':' . $k1 => $v1;
+			}
+		});
+
+		Assert::same('Hi Ales!', $translator->translate('hi', ['name' => 'Ales']));
+		Assert::same('Hi Ales!', $translator->translate(new Message('hi', ['name' => 'Ales'])));
+	}
+
+}
+
+(new CustomTranslateKeyTest($container))->run();