diff --git a/types/knex/index.d.ts b/types/knex/index.d.ts
index eecfde8774..c34c4a7000 100644
--- a/types/knex/index.d.ts
+++ b/types/knex/index.d.ts
@@ -403,6 +403,7 @@ declare namespace Knex {
     interface SchemaBuilder extends Bluebird<any> {
         createTable(tableName: string, callback: (tableBuilder: CreateTableBuilder) => any): SchemaBuilder;
         createTableIfNotExists(tableName: string, callback: (tableBuilder: CreateTableBuilder) => any): SchemaBuilder;
+        alterTable(tableName: string, callback: (tableBuilder: CreateTableBuilder) => any): SchemaBuilder;
         renameTable(oldTableName: string, newTableName: string): Bluebird<void>;
         dropTable(tableName: string): SchemaBuilder;
         hasTable(tableName: string): Bluebird<boolean>;
diff --git a/types/knex/knex-tests.ts b/types/knex/knex-tests.ts
index 3e8e798212..c5f42ec9ae 100644
--- a/types/knex/knex-tests.ts
+++ b/types/knex/knex-tests.ts
@@ -763,6 +763,10 @@ knex.schema.createTable('users', function (table) {
   table.timestamps(true, true);
 });
 
+knex.schema.alterTable('users', function (table) {
+  table.string('role').nullable();
+});
+
 knex.schema.renameTable('users', 'old_users');
 
 knex.schema.dropTable('users');