diff --git a/EventInterface.php b/EventInterface.php
index 89e2e60..61d90b6 100644
--- a/EventInterface.php
+++ b/EventInterface.php
@@ -4,10 +4,11 @@ namespace Kiri\Events;
 
 interface EventInterface
 {
+	
+	/**
+	 * @param object $event
+	 * @return void
+	 */
+    public function process(object $event): void;
 
-    /**
-     * @return void
-     */
-    public function process(): void;
-
-}
\ No newline at end of file
+}
diff --git a/TestListener.php b/TestListener.php
index 695e6ea..18880b8 100644
--- a/TestListener.php
+++ b/TestListener.php
@@ -4,14 +4,15 @@ namespace Kiri\Events;
 
 class TestListener implements EventInterface
 {
-
-
-    /**
-     * @return void
-     */
-    public function process(): void
+	
+	
+	/**
+	 * @param object $event
+	 * @return void
+	 */
+    public function process(object $event): void
     {
         // TODO: Implement process() method.
     }
 
-}
\ No newline at end of file
+}