diff --git a/.travis.yml b/.travis.yml
index ca6f715..6baa987 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: php
 php:
   - 7.0
   - 7.1
+  - 7.2
 
 sudo: false
 
diff --git a/src/Dusker/CopyFile.php b/src/Dusker/CopyFile.php
index d67a2e5..ffa1fa8 100644
--- a/src/Dusker/CopyFile.php
+++ b/src/Dusker/CopyFile.php
@@ -17,7 +17,7 @@ class CopyFile
      *
      * @throws \InvalidArgumentException
      */
-    public static function copy(Event $event): void
+    public static function copy(Event $event)
     {
         $extras = $event->getComposer()->getPackage()->getExtra();