diff --git a/spec/acceptance/selenium_hub_spec.rb b/spec/acceptance/selenium_hub_spec.rb
index 238db0f..e89d1f4 100644
--- a/spec/acceptance/selenium_hub_spec.rb
+++ b/spec/acceptance/selenium_hub_spec.rb
@@ -33,7 +33,11 @@ class { 'selenium::hub': }
       it { should be_file }
       it { should be_owned_by 'selenium' }
       it { should be_grouped_into 'selenium' }
-      it { should be_mode 644}
+      if fact('operatingsystem') == 'Ubuntu'
+        it { should be_mode 664 }
+      else
+        it { should be_mode 644 }
+      end
     end
   end
 
diff --git a/spec/acceptance/selenium_node_spec.rb b/spec/acceptance/selenium_node_spec.rb
index 389c1ff..dc7b43f 100644
--- a/spec/acceptance/selenium_node_spec.rb
+++ b/spec/acceptance/selenium_node_spec.rb
@@ -33,7 +33,11 @@ class { 'selenium::node': }
       it { should be_file }
       it { should be_owned_by 'selenium' }
       it { should be_grouped_into 'selenium' }
-      it { should be_mode 644}
+      if fact('operatingsystem') == 'Ubuntu'
+        it { should be_mode 664 }
+      else
+        it { should be_mode 644 }
+      end
     end
   end
 
diff --git a/spec/acceptance/selenium_server_spec.rb b/spec/acceptance/selenium_server_spec.rb
index 92f1a8a..1019d25 100644
--- a/spec/acceptance/selenium_server_spec.rb
+++ b/spec/acceptance/selenium_server_spec.rb
@@ -33,7 +33,11 @@ class { 'selenium::server': }
       it { should be_file }
       it { should be_owned_by 'selenium' }
       it { should be_grouped_into 'selenium' }
-      it { should be_mode 644}
+      if fact('operatingsystem') == 'Ubuntu'
+        it { should be_mode 664 }
+      else
+        it { should be_mode 644 }
+      end
     end
   end