Drivers trying to dodge parking fees in East Grinstead will have further to travel.
Motorists are avoiding the new on-street parking zones by using roads just outside its boundary.
But people living in the roads said they have found it increasingly difficult to park outside their homes.
Now a series of changes to the system, which was launched in May, have been approved by West Sussex County Council, which is spending £5,000 to sort out the problem.
Single yellow lines are being painted in Blount Avenue and Lodge Close, with residents' parking bays introduced in Crescent Road.
The council will also put down double yellow lines at the junction of West Hill and Gardenswood Road with Brooklands Way.
Derrick Fawcett, the council's head of highways, said: "It is to be expected that during the first few months of operation unexpected problems will come to light which will require changes.
"But the overall impression after the first four months is that the scheme has been operating satisfactorily."
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