diff --git a/lib/migration.js b/lib/migration.js
index c526fca..ce8950b 100644
--- a/lib/migration.js
+++ b/lib/migration.js
@@ -156,13 +156,6 @@ function mixinMigration(MySQL, mysql) {
     });
   };
 
-  MySQL.prototype.getAddModifyColumns = function(model, actualFields) {
-    var sql = [];
-    var self = this;
-    sql = sql.concat(self.getColumnsToAdd(model, actualFields));
-    return sql;
-  };
-
   MySQL.prototype.getColumnsToAdd = function(model, actualFields) {
     var self = this;
     var m = this.getModelDefinition(model);
@@ -222,13 +215,6 @@ function mixinMigration(MySQL, mysql) {
     return sql;
   };
 
-  MySQL.prototype.getDropColumns = function(model, actualFields) {
-    var sql = [];
-    var self = this;
-    sql = sql.concat(self.getColumnsToDrop(model, actualFields));
-    return sql;
-  };
-
   MySQL.prototype.getColumnsToDrop = function(model, actualFields) {
     var self = this;
     var fields = actualFields;