diff --git a/lib/DateTime/Shared.php b/lib/DateTime/Shared.php
index fae646c..02d4e3f 100644
--- a/lib/DateTime/Shared.php
+++ b/lib/DateTime/Shared.php
@@ -346,7 +346,7 @@ public function change(array $options, $cascade = false)
 	 *
 	 * @return mixed
 	 *
-	 * @throws \RuntimeException if {@link $localizer} is not defined.
+	 * @throws \LogicException if {@link $localizer} is not defined.
 	 */
 	public function localize($locale = 'en')
 	{
@@ -354,7 +354,7 @@ public function localize($locale = 'en')
 
 		if (!$localizer)
 		{
-			throw new \RuntimeException("Localizer is not defined yet.");
+			throw new \LogicException("Localizer is not defined yet.");
 		}
 
 		return $localizer($this, $locale);
diff --git a/tests/AbstractDateTimeTest.php b/tests/AbstractDateTimeTest.php
index b1762a6..43fe435 100644
--- a/tests/AbstractDateTimeTest.php
+++ b/tests/AbstractDateTimeTest.php
@@ -928,7 +928,7 @@ public function test_json_serialize()
 	}
 
 	/**
-	 * @expectedException \RuntimeException
+	 * @expectedException \LogicException
 	 */
 	public function test_localize_should_throw_an_exception_if_the_localizer_is_not_defined_yet()
 	{