diff --git a/manifests/init.pp b/manifests/init.pp
index ffadc4c..18fa612 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -71,9 +71,11 @@ class mastodon (
     'wget',
     'zlib1g-dev',
   ]
-  if (!defined(Package[$packages])) {
-    package { $packages:
-      ensure => $package_ensure,
+  $packages.each | $package | {
+    if (!defined(Package[$package])) {
+      package { $package:
+        ensure => $package_ensure,
+      }
     }
   }
   class { 'nodejs':