diff --git a/lib/puppet/type/volume_group.rb b/lib/puppet/type/volume_group.rb
index 8b296767..6e3afe37 100644
--- a/lib/puppet/type/volume_group.rb
+++ b/lib/puppet/type/volume_group.rb
@@ -11,6 +11,14 @@
              will automatically set these as dependencies, but they must be defined elsewhere
              using the physical_volume resource type."
 
+        munge do |value|
+          if value.is_a?(Hash) then
+            value.keys.sort
+          else
+            value
+          end
+        end
+
         def insync?(is)
           if @resource.parameter(:followsymlinks).value == :true then
             real_should = []