diff --git a/data/sql/migrate/006_add_timestamps.rb b/data/sql/migrate/006_add_timestamps.rb
index fe83ab2d5a..446a83aa29 100644
--- a/data/sql/migrate/006_add_timestamps.rb
+++ b/data/sql/migrate/006_add_timestamps.rb
@@ -3,24 +3,24 @@
 #
 class AddTimestamps < ActiveRecord::Migration
 
-	TABLES_NEEDING_RENAME = [:clients, :hosts, :notes, :refs, :services, :vulns, :wmap_requests]
-	TABLES_NEEDING_CREATED_AT = [:wmap_targets]
-	TABLES_NEEDING_UPDATED_AT = [:clients, :events, :hosts, :notes, :refs, :services, :vulns, :wmap_requests, :wmap_targets]
+	@@TABLES_NEEDING_RENAME = [:clients, :hosts, :notes, :refs, :services, :vulns, :wmap_requests]
+	@@TABLES_NEEDING_CREATED_AT = [:wmap_targets]
+	@@TABLES_NEEDING_UPDATED_AT = [:clients, :events, :hosts, :notes, :refs, :services, :vulns, :wmap_requests, :wmap_targets]
 
 	def self.up
-		TABLES_NEEDING_RENAME.each { |t| rename_column t, :created, :created_at }
+		@@TABLES_NEEDING_RENAME.each { |t| rename_column t, :created, :created_at }
 		
-		TABLES_NEEDING_CREATED_AT.each { |t| add_column t, :created_at, :datetime }
+		@@TABLES_NEEDING_CREATED_AT.each { |t| add_column t, :created_at, :datetime }
 
-		TABLES_NEEDING_UPDATED_AT.each { |t| add_column t, :updated_at, :datetime }
+		@@TABLES_NEEDING_UPDATED_AT.each { |t| add_column t, :updated_at, :datetime }
 	end
 
 	def self.down
-		TABLES_NEEDING_RENAME.each { |t| rename_column t, :created_at, :created }
+		@@TABLES_NEEDING_RENAME.each { |t| rename_column t, :created_at, :created }
 		
-		TABLES_NEEDING_CREATED_AT.each { |t| remove_column t, :created_at }
+		@@TABLES_NEEDING_CREATED_AT.each { |t| remove_column t, :created_at }
 
-		TABLES_NEEDING_UPDATED_AT.each { |t| remove_column t, :updated_at }
+		@@TABLES_NEEDING_UPDATED_AT.each { |t| remove_column t, :updated_at }
 	end
 end