diff --git a/groups/app/models/member.rb b/groups/app/models/member.rb
index b16f6a8ea..6d94aca9b 100644
--- a/groups/app/models/member.rb
+++ b/groups/app/models/member.rb
@@ -50,7 +50,9 @@ class Member < ActiveRecord::Base
     if principal.is_a? Group
       Member.delete_all "inherited_from = #{id}"
       principal.users.each do |user|
-        Member.create! :project => project, :role => role, :principal => user, :inherited_from => id
+        inherited = Member.new :project => project, :role => role, :principal => user
+        inherited.inherited_from = id
+        inherited.save!
       end
     end
   end
diff --git a/groups/app/models/user.rb b/groups/app/models/user.rb
index ecc4b569c..3743fcb3f 100644
--- a/groups/app/models/user.rb
+++ b/groups/app/models/user.rb
@@ -85,7 +85,10 @@ class User < ActiveRecord::Base
       Member.delete_all "principal_type = 'User' AND principal_id = #{id} AND inherited_from IS NOT NULL"
       unless group.nil?
         group.memberships.each do |m|
-          Member.create! :project => m.project, :role => m.role, :principal => self, :inherited_from => m.id
+          inherited = Member.new :project => m.project, :role => m.role, :principal => self
+          # protected attribute
+          inherited.inherited_from = m.id
+          inherited.save!
         end
       end
     end