Subway has killed the $5 footlong

Subway's most iconic deal just got a dollar more expensive.

The sandwich chain announced on Tuesday that it would be offering a $6 deal on all classic footlong subs. Unfortunately for Subway, the chain's "$5 footlong" campaign with the super-catchy jingle is still fresh in customers' minds.

Subway responded to annoyed customers on Twitter, saying the move to $6 from $5 was necessary because of cost increases.

The sandwich chain launched the $5 footlong in 2007. The footlong deal has traditionally taken place in February, though over the years there have been other periods in which pricing on select footlongs has been lowered to $5.

Times have been tough at Subway in recent years. In 2015, former spokesman Jared Fogle was sentenced to nearly 16 years in prison for child pornography and sex charges. Subway's sales dropped 3% in 2014 to $11.9 billion, according to QSR magazine.