diff --git a/manifests/init.pp b/manifests/init.pp
index 25b788f0..414df909 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -372,7 +372,7 @@
   validate_legacy(String, 'validate_string', $apt_release)
 
   if $hiera_tags {
-    $local_tags = lookup({ 'name' => 'datadog_agent::tags', 'default_value' => []})
+    $local_tags = lookup({ 'name' => 'datadog_agent::tags', 'merge' => 'unique', 'default_value' => []})
   } else {
     $local_tags = $tags
   }