diff --git a/3rdparty/vendor/composer/ClassLoader.php b/3rdparty/vendor/composer/ClassLoader.php
index fce8549..03b9bb9 100644
--- a/3rdparty/vendor/composer/ClassLoader.php
+++ b/3rdparty/vendor/composer/ClassLoader.php
@@ -60,7 +60,7 @@ class ClassLoader
     public function getPrefixes()
     {
         if (!empty($this->prefixesPsr0)) {
-            return call_user_func_array('array_merge', $this->prefixesPsr0);
+            return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
         }
 
         return array();
diff --git a/Makefile b/Makefile
index 498ac1e..ca9d2e1 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,7 @@ clean:
 	rm -rf node_modules
 
 appstore: clean
+	composer install --no-dev -d ./3rdparty/
 	mkdir -p $(sign_dir)
 	rsync -a \
 	--exclude=.drone.yml \