diff --git a/src/App.php b/src/App.php
index 8cd3b74f99..0ba8207798 100644
--- a/src/App.php
+++ b/src/App.php
@@ -2000,7 +2000,7 @@ class App
 	public function internalRedirect($toUrl = '', $ssl = false)
 	{
 		if (filter_var($toUrl, FILTER_VALIDATE_URL)) {
-			throw new InternalServerErrorException('URL is not a relative path, please use System::externalRedirectTo');
+			throw new InternalServerErrorException("'$toUrl is not a relative path, please use System::externalRedirectTo");
 		}
 
 		$redirectTo = $this->getBaseURL($ssl) . '/' . ltrim($toUrl, '/');
diff --git a/src/Core/System.php b/src/Core/System.php
index e071866ee9..6079d9e228 100644
--- a/src/Core/System.php
+++ b/src/Core/System.php
@@ -247,7 +247,7 @@ class System extends BaseObject
 	public static function externalRedirect($url)
 	{
 		if (!filter_var($url, FILTER_VALIDATE_URL)) {
-			throw new InternalServerErrorException('URL is not a fully qualified URL, please use App->internalRedirect() instead');
+			throw new InternalServerErrorException("'$url' is not a fully qualified URL, please use App->internalRedirect() instead");
 		}
 
 		header("Location: $url");
diff --git a/tests/src/Core/SystemTest.php b/tests/src/Core/SystemTest.php
index b85bce44cb..6b0781198a 100644
--- a/tests/src/Core/SystemTest.php
+++ b/tests/src/Core/SystemTest.php
@@ -34,4 +34,4 @@ class SystemTest extends TestCase
 		$guid = System::createGUID(23, 'test');
 		$this->assertGuid($guid, 23, 'test');
 	}
-}
\ No newline at end of file
+}