Tube workers on the Waterloo and City Line will go on strike for 48 hours from Monday.
Control room staff will walk out from 9pm on Monday, September 28 to 11pm on Wednesday, September 30, however this will not affect the line.
The action has been called by the Rail, Maritime and Transport union (RMT), with just three people voting it in according to London Underground.
Peter McNaught, London Underground's operations director for the Waterloo and City line, said: "Due to detailed planning there will be no visible impact on the network should this unnecessary strike action go ahead. We remain committed to discussions with the RMT representatives and I urge them to consider the options we’ve proposed rather than threaten industrial action.
"We’ve been in extensive discussions with the RMT over this issue during the past year and we’ve presented various options to bring this dispute to an end. These have included exploring development opportunities to help progress the careers of the staff concerned as well as allocating additional responsibilities that would justify a salary increase.
“Unfortunately all of these options have been rejected outright by the RMT who appear determined to demand more money for no additional work or responsibility. We remain committed to discussions with the RMT representatives and I urge them to consider the options we’ve proposed rather than threaten industrial action.”
RMT secretary Mick Cash said: “London Underground (LU) management must be clear by now on our members legitimate and reasonable demand for re-grading. The union has re-iterated that we will not accept an offer which is based on a change in staff duties or which would cause a detriment to other members. Although LU has declined our request for arbitration at Acas, they are aware that as always we remain available for talks to resolve the dispute.”
Train drivers will not be involved in the strike and six of the eight control room staff working on the line are RMT members.