diff --git a/lib/puppet/provider/a2mod/a2mod.rb b/lib/puppet/provider/a2mod/a2mod.rb
index a2fdd7c..56e293e 100644
--- a/lib/puppet/provider/a2mod/a2mod.rb
+++ b/lib/puppet/provider/a2mod/a2mod.rb
@@ -1,21 +1,21 @@
 Puppet::Type.type(:a2mod).provide(:a2mod) do
     desc "Manage Apache 2 modules on Debian and Ubuntu"
- 
-    commands :encmd => "a2enmod"
-    commands :discmd => "a2dismod"
- 
+
+    optional_commands :encmd => "a2enmod"
+    optional_commands :discmd => "a2dismod"
+
     defaultfor :operatingsystem => [:debian, :ubuntu]
 
     def create
         encmd resource[:name]
     end
- 
+
     def destroy
         discmd resource[:name]
     end
- 
+
     def exists?
-        mod= "/etc/apache2/mods-enabled/" + resource[:name] + ".load" 
+        mod= "/etc/apache2/mods-enabled/" + resource[:name] + ".load"
         File.exists?(mod)
     end
 end