diff --git a/app/helpers/database_helper.rb b/app/helpers/database_helper.rb
index 358239079..e65ebe285 100644
--- a/app/helpers/database_helper.rb
+++ b/app/helpers/database_helper.rb
@@ -54,4 +54,16 @@ module DatabaseHelper
     ).getvalue(0, 0).to_i
   end
 
-end
\ No newline at end of file
+  # Adds email domain constraint to the users table.
+  def add_email_constraint(domain)
+    ActiveRecord::Base.connection.execute(
+      "ALTER TABLE " \
+         "users " \
+      "DROP CONSTRAINT IF EXISTS email_must_be_company_email, " \
+      "ADD CONSTRAINT " \
+        "email_must_be_company_email " \
+      "CHECK ( email ~* '^[A-Za-z0-9._%-]+@#{domain}' ) " \
+      "not valid;"
+    )
+  end
+end
diff --git a/lib/tasks/sign_up_constraint.rake b/lib/tasks/sign_up_constraint.rake
index 3dfbbd4e9..d8953e662 100644
--- a/lib/tasks/sign_up_constraint.rake
+++ b/lib/tasks/sign_up_constraint.rake
@@ -2,6 +2,8 @@ namespace :sign_up_constraint do
   desc 'Adds email domain constraint to the users table. '\
         'E.g: scinote.net'
   task :email_domain, [:domain] => :environment do |_, args|
+    include DatabaseHelper
+
     if args.blank? ||
        args.empty? ||
        args[:domain].blank?
@@ -12,15 +14,7 @@ namespace :sign_up_constraint do
     domain = args[:domain]
     domain = domain.strip.gsub(/\./, '\\.')
 
-    ActiveRecord::Base.connection.execute(
-      "ALTER TABLE " \
-         "users " \
-      "DROP CONSTRAINT IF EXISTS email_must_be_company_email, " \
-      "ADD CONSTRAINT " \
-        "email_must_be_company_email " \
-      "CHECK ( email ~* '^[A-Za-z0-9._%-]+@#{domain}' ) " \
-      "not valid;"
-    )
+    add_email_constraint(domain)
     puts "Created the following domain constraint: #{args[:domain]}"
   end