diff --git a/apps/dav/tests/unit/Connector/Sabre/ExceptionLoggerPluginTest.php b/apps/dav/tests/unit/Connector/Sabre/ExceptionLoggerPluginTest.php
index ba28c39e09..ff928ccede 100644
--- a/apps/dav/tests/unit/Connector/Sabre/ExceptionLoggerPluginTest.php
+++ b/apps/dav/tests/unit/Connector/Sabre/ExceptionLoggerPluginTest.php
@@ -41,7 +41,7 @@ class TestLogger extends Log {
 		//disable original constructor
 	}
 
-	public function log($level, string $message, array $context = array()) {
+	public function log(int $level, string $message, array $context = array()) {
 		$this->level = $level;
 		$this->message = $message;
 	}
diff --git a/lib/private/Log.php b/lib/private/Log.php
index a18b5db7d0..e47f68807d 100644
--- a/lib/private/Log.php
+++ b/lib/private/Log.php
@@ -245,12 +245,12 @@ class Log implements ILogger {
 	/**
 	 * Logs with an arbitrary level.
 	 *
-	 * @param mixed $level
+	 * @param int $level
 	 * @param string $message
 	 * @param array $context
 	 * @return void
 	 */
-	public function log($level, string $message, array $context = []) {
+	public function log(int $level, string $message, array $context = []) {
 		$minLevel = min($this->config->getValue('loglevel', Util::WARN), Util::FATAL);
 		$logCondition = $this->config->getValue('log.condition', []);
 
diff --git a/lib/public/ILogger.php b/lib/public/ILogger.php
index 9370913a82..b6e945546e 100644
--- a/lib/public/ILogger.php
+++ b/lib/public/ILogger.php
@@ -120,13 +120,13 @@ interface ILogger {
 	/**
 	 * Logs with an arbitrary level.
 	 *
-	 * @param mixed $level
+	 * @param int $level
 	 * @param string $message
 	 * @param array $context
 	 * @return mixed
 	 * @since 7.0.0
 	 */
-	public function log($level, string $message, array $context = []);
+	public function log(int $level, string $message, array $context = []);
 
 	/**
 	 * Logs an exception very detailed
diff --git a/tests/lib/TempManagerTest.php b/tests/lib/TempManagerTest.php
index 15b22a7b30..c9e069d9d0 100644
--- a/tests/lib/TempManagerTest.php
+++ b/tests/lib/TempManagerTest.php
@@ -17,7 +17,7 @@ class NullLogger extends Log {
 		//disable original constructor
 	}
 
-	public function log($level, string $message, array $context = array()) {
+	public function log(int $level, string $message, array $context = array()) {
 		//noop
 	}
 }