diff --git a/lib/puppet_x/lvm/output.rb b/lib/puppet_x/lvm/output.rb
index 6ab0a77b..46f1314f 100644
--- a/lib/puppet_x/lvm/output.rb
+++ b/lib/puppet_x/lvm/output.rb
@@ -34,6 +34,7 @@ def self.remove_prefixes(array)
       end
 
       def self.remove_prefix(item)
+        return item if item == 'dev_size'
         item.gsub(%r{^[A-Za-z]+_}, '')
       end
     end
diff --git a/spec/unit/facter/physical_volumes_spec.rb b/spec/unit/facter/physical_volumes_spec.rb
index 46561ff1..bff4f202 100644
--- a/spec/unit/facter/physical_volumes_spec.rb
+++ b/spec/unit/facter/physical_volumes_spec.rb
@@ -46,6 +46,7 @@
         Facter::Core::Execution.expects(:exec).at_least(1).returns(pvs_output)
         Facter.value(:physical_volumes).should include('/dev/sda' => {
                                                          'uuid' => 'dPziSO-573Z-9WuH-q22X-cuyM-gHQx-ZeGbfK',
+                                                         'dev_size' => '2.00g',
                                                          'size' => '2.00g',
                                                          'start' => '1.00m',
                                                          'free' => '844.00m',
@@ -60,6 +61,7 @@
                                                        },
                                                        '/dev/sdc' => {
                                                          'uuid' => '09ksGm-Pt28-AR9H-NlgQ-QxtG-5uEH-Qzy1RR',
+                                                         'dev_size' => '2.00g',
                                                          'size' => '2.00g',
                                                          'start' => '1.00m',
                                                          'free' => '2.00g',
@@ -74,6 +76,7 @@
                                                        },
                                                        '/dev/sdd2' => {
                                                          'uuid' => 'PpSFVZ-SS3P-n3a6-ctPF-sb9H-6M85-i0TqBv',
+                                                         'dev_size' => '19.51g',
                                                          'size' => '19.51g',
                                                          'start' => '1.00m',
                                                          'free' => '44.00m',