diff --git a/Gemfile b/Gemfile
index 2acc79560..50ea448b2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,6 +16,7 @@ gem 'rubocop', '< 0.42.0'
 
 gem 'json_pure', '< 2.0.2'
 gem 'net-http-persistent', '<= 2.9.4', :require => false if RUBY_VERSION < '2.0.0'
+gem 'addressable', '<= 2.4.0', :require => false if RUBY_VERSION < '2.0.0'
 
 group :development do
   gem 'simplecov'
diff --git a/manifests/plugin.pp b/manifests/plugin.pp
index a5e25b52c..9637b2f64 100644
--- a/manifests/plugin.pp
+++ b/manifests/plugin.pp
@@ -160,10 +160,12 @@
 
     if $digest_string {
       $checksum_verify = true
-      $checksum = $digest_string
+      $checksum        = $digest_string
+      $checksum_type   = $digest_type
     } else {
       $checksum_verify = false
-      $checksum = undef
+      $checksum        = undef
+      $checksum_type   = undef
     }
 
     archive { $plugin:
@@ -171,7 +173,7 @@
       path            => "${::jenkins::plugin_dir}/${plugin}",
       checksum_verify => $checksum_verify,
       checksum        => $checksum,
-      checksum_type   => $digest_type,
+      checksum_type   => $checksum_type,
       proxy_server    => $::jenkins::proxy::url,
       cleanup         => false,
       extract         => false,