diff --git a/manifests/plugin.pp b/manifests/plugin.pp
index d4e86a4..31ddc2e 100644
--- a/manifests/plugin.pp
+++ b/manifests/plugin.pp
@@ -46,6 +46,7 @@
     timeout => $timeout,
     cwd     => $destination,
     require => Exec["rbenv::plugin::checkout ${user} ${plugin_name}"],
+    onlyif  => 'git remote update; if [ "$(git rev-parse @{0})" = "$(git rev-parse @{u})" ]; then return 0; else return 1; fi ]',
   }
 
 }
diff --git a/spec/defines/rbenv__plugin_spec.rb b/spec/defines/rbenv__plugin_spec.rb
index 2dbe067..20181af 100644
--- a/spec/defines/rbenv__plugin_spec.rb
+++ b/spec/defines/rbenv__plugin_spec.rb
@@ -26,7 +26,10 @@
       :user    => user,
       :cwd     => target_path,
       :require => /rbenv::plugin::checkout #{user} #{plugin_name}/,
-      :path    => ['/bin','/usr/bin','/usr/sbin']
+      :path    => ['/bin','/usr/bin','/usr/sbin'],
+      :onlyif  => 'git remote update; ' \
+                  'if [ "$(git rev-parse @{0})" = "$(git rev-parse @{u})" ]; ' \
+                  'then return 0; else return 1; fi ]'
     )
   end