diff --git a/src/Gaufrette/Adapter/AzureBlobStorage.php b/src/Gaufrette/Adapter/AzureBlobStorage.php
index 92875f0d..4a8707ae 100644
--- a/src/Gaufrette/Adapter/AzureBlobStorage.php
+++ b/src/Gaufrette/Adapter/AzureBlobStorage.php
@@ -53,7 +53,7 @@ public function getCreateContainerOptions(): CreateContainerOptions
         return $this->createContainerOptions;
     }
 
-    public function setCreateContainerOptions(CreateContainerOptions $options)
+    public function setCreateContainerOptions(CreateContainerOptions $options): void
     {
         $this->createContainerOptions = $options;
     }