diff --git a/spec/acceptance/concat_spec.rb b/spec/acceptance/concat_spec.rb
index d2950e7..708559a 100644
--- a/spec/acceptance/concat_spec.rb
+++ b/spec/acceptance/concat_spec.rb
@@ -4,6 +4,9 @@ case fact('osfamily')
 when 'AIX'
   username  = 'root'
   groupname = 'system'
+when 'Darwin'
+  username  = 'root'
+  groupname = 'wheel'
 when 'windows'
   username  = 'Administrator'
   groupname = 'Administrators'
diff --git a/spec/acceptance/fragment_source_spec.rb b/spec/acceptance/fragment_source_spec.rb
index 610ec5c..82a3cba 100644
--- a/spec/acceptance/fragment_source_spec.rb
+++ b/spec/acceptance/fragment_source_spec.rb
@@ -4,6 +4,9 @@ case fact('osfamily')
 when 'AIX'
   username  = 'root'
   groupname = 'system'
+when 'Darwin'
+  username  = 'root'
+  groupname = 'wheel'
 when 'windows'
   username  = 'Administrator'
   groupname = 'Administrators'