diff --git a/app/models/user.rb b/app/models/user.rb
index 4ce63f809..4210a6a87 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -643,7 +643,7 @@ class User < Principal
   def projects_by_role
     return @projects_by_role if @projects_by_role
 
-    result = Hash.new([])
+    result = Hash.new {|_h, _k| []}
     project_ids_by_role.each do |role, ids|
       result[role] = Project.where(:id => ids).to_a
     end
@@ -676,7 +676,7 @@ class User < Principal
         hash[role_id] << project_id
       end
 
-      result = Hash.new([])
+      result = Hash.new {|_h, _k| []}
       if hash.present?
         roles = Role.where(:id => hash.keys).to_a
         hash.each do |role_id, proj_ids|