diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 74cbe2c1..7ac81281 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -163,11 +163,13 @@ private function normalizeConfig(array $config): array
             return $config;
         }
 
-        $config['monolog']['type']            ??= 'monolog';
-        $config['monolog']['name']            ??= 'Monolog';
-        $config['monolog']['finder']['in']    ??= '%kernel.logs_dir%';
-        $config['monolog']['finder']['name']  ??= '*.log';
-        $config['monolog']['finder']['depth'] ??= '== 0';
+        $config['monolog']['type']                  ??= 'monolog';
+        $config['monolog']['name']                  ??= 'Monolog';
+        $config['monolog']['finder']['in']          ??= '%kernel.logs_dir%';
+        $config['monolog']['finder']['name']        ??= '*.log';
+        $config['monolog']['finder']['depth']       ??= '== 0';
+        $config['monolog']['start_of_line_pattern'] ??= MonologLineParser::START_OF_MESSAGE_PATTERN;
+        $config['monolog']['log_message_pattern']   ??= MonologLineParser::LOG_LINE_PATTERN;
 
         return $config;
     }
diff --git a/tests/Integration/DependencyInjection/data/expected-merge-monolog-config.json b/tests/Integration/DependencyInjection/data/expected-merge-monolog-config.json
index 9182266f..a83304fd 100644
--- a/tests/Integration/DependencyInjection/data/expected-merge-monolog-config.json
+++ b/tests/Integration/DependencyInjection/data/expected-merge-monolog-config.json
@@ -12,8 +12,8 @@
                 "ignoreUnreadableDirs": true,
                 "followLinks": false
             },
-            "start_of_line_pattern": null,
-            "log_message_pattern": null,
+            "start_of_line_pattern": "/^\\[\\d{4}-\\d{2}-\\d{2}[^]]*]\\s+\\S+\\.\\S+:/",
+            "log_message_pattern": "/^\\[(?P<date>[^\\]]+)\\]\\s+(?P<channel>[^\\.]+)\\.(?P<severity>[^:]+):\\s+(?P<message>.*)\\s+(?P<context>(?:{.*?}|\\[.*?]))\\s+(?P<extra>(?:{.*?}|\\[.*?]))\\s+$/s",
             "date_format": null
         }
     },
diff --git a/tests/Unit/Controller/DeleteFileControllerTest.php b/tests/Unit/Controller/DeleteFileControllerTest.php
index 36eb19d1..90590dca 100644
--- a/tests/Unit/Controller/DeleteFileControllerTest.php
+++ b/tests/Unit/Controller/DeleteFileControllerTest.php
@@ -12,7 +12,6 @@
 use PHPUnit\Framework\MockObject\MockObject;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
@@ -69,9 +68,8 @@ public function testInvokeSuccess(): void
         $this->filesystem->expects(self::once())->method('remove')->with('path');
         $this->fileService->expects(self::once())->method('findFileByIdentifier')->with('identifier')->willReturn($logFile);
 
-        $expected = new JsonResponse(['success' => true]);
         $response = ($this->controller)('identifier');
-        static::assertEquals($expected, $response);
+        static::assertEquals('{"success":true}', $response->getContent());
     }
 
     public function getController(): AbstractController