diff --git a/types/knex/index.d.ts b/types/knex/index.d.ts
index c34c4a7000..1d405f54b0 100644
--- a/types/knex/index.d.ts
+++ b/types/knex/index.d.ts
@@ -153,6 +153,7 @@ declare namespace Knex {
         pluck(column: string): QueryBuilder;
 
         insert(data: any, returning?: string | string[]): QueryBuilder;
+        modify(callback: QueryCallback, ...args: any[]): QueryBuilder;
         update(data: any, returning?: string | string[]): QueryBuilder;
         update(columnName: string, value: Value, returning?: string | string[]): QueryBuilder;
         returning(column: string | string[]): QueryBuilder;
diff --git a/types/knex/knex-tests.ts b/types/knex/knex-tests.ts
index c5f42ec9ae..1afd65ef6d 100644
--- a/types/knex/knex-tests.ts
+++ b/types/knex/knex-tests.ts
@@ -1030,6 +1030,9 @@ knex('users')
   }).unionAll(function(builder) {
     let self: Knex.QueryBuilder = this;
     self = builder;
+  }).modify(function(builder) {
+    let self: Knex.QueryBuilder = this;
+    self = builder;
   });
 
 //