diff --git a/Gemfile b/Gemfile
index 1a88250..5de1873 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,8 +15,10 @@ group :development, :unit_tests do
   gem 'puppetlabs_spec_helper',  :require => false
   gem 'simplecov',               :require => false
   gem 'puppet_facts',            :require => false
-  gem 'json',                    :require => false
+  gem "json", '~> 1.8.3',        :require => false
+  gem "json_pure", '~> 1.8.3',   :require => false
   gem 'metadata-json-lint',      :require => false
+  gem "rake", '< 11.0.0',        :require => false
 end
 
 group :system_tests do
diff --git a/lib/puppet/type/acl.rb b/lib/puppet/type/acl.rb
index 5de3ba0..7c71cd7 100644
--- a/lib/puppet/type/acl.rb
+++ b/lib/puppet/type/acl.rb
@@ -157,9 +157,8 @@ def unset_insync(cur_perm)
     end
 
     def set_insync(cur_perm)
-      # Puppet.debug "permission.set_insync"
-      test_should = @should.map { |x| x.downcase() }.uniq
-      (cur_perm.sort == test_should.sort) or (provider.check_set and ((test_should - cur_perm).length == 0))
+      should = @should.uniq.sort
+      (cur_perm.sort == should) or (provider.check_set and ((should - cur_perm).length == 0))
     end
 
     def purge_insync(cur_perm)
@@ -174,15 +173,14 @@ def purge_insync(cur_perm)
     end
 
     def insync?(is)
-      cur_perm = provider.permission
-      Puppet.debug "permission.insync? cur_perm: #{cur_perm.inspect} @should: #{@should.inspect}"
+      Puppet.debug "permission.insync? is: #{is.inspect} @should: #{@should.inspect}"
       if provider.check_purge
-        return purge_insync(cur_perm)
+        return purge_insync(is)
       end
       if provider.check_unset
-        return unset_insync(cur_perm)
+        return unset_insync(is)
       end
-      return set_insync(cur_perm)
+      return set_insync(is)
     end
 
     # Munge into normalised form