diff --git a/src/SplitProvider.php b/src/SplitProvider.php
index ae9df27..9a4dc46 100644
--- a/src/SplitProvider.php
+++ b/src/SplitProvider.php
@@ -70,7 +70,7 @@ public function __construct(?string $apiKey = '', array $options = [])
         $this->client = $factory->client();
     }
 
-    public function setLogger(LoggerInterface $logger)
+    public function setLogger(LoggerInterface $logger): void
     {
         Di::setLogger($logger);
     }