errno150 cant create table migration

this my code schema goimon

public function up()
    {
        Schema::create('goimon', function (Blueprint $table) {
            $table->engine = 'InnoDB';
            $table->charset = 'utf8';
            $table->collation = 'utf8_unicode_ci';
            $table->increments('MaGoiMon');
            $table->string('TinhTrang');
            //$table->unsignedInteger('MaNhanVien');
            $table->integer('MaNhanVien')->unsigned();
            $table->unsignedInteger('MaBan');
            $table->foreign('MaBan')->references('MaBan')->on('banan');
            $table->foreign('MaNhanVien')->references('MaNhanVien')->on('nhanvien');
            $table->timestamps();
        });


    }

and second schema :

public function up()
    {
        Schema::create('nhanvien', function (Blueprint $table) {
             $table->engine = 'InnoDB';

            $table->increments('MaNhanVien');
            $table->string('TenNhanVien');
            $table->string('TenDangNhap');
            $table->string('MatKhau');
            $table->boolean('GioiTinh');
            $table->date('NgaySinh');
            $table->integer('CMND');
            $table->integer('quyen');
            $table->timestamps();
        });
    }

and my error

Illuminate\Database\QueryException : SQLSTATE[HY000]: General error: 1005 Can't create table qlnhahang.#sql-12bc_ 491 (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table goimon add constraint goimon_manha nvien_foreign foreign key (MaNhanVien) references nhanvien (MaNhanVien))

via Chebli Mohamed