An age-old practice in the service industry has recently been the subject of many American consumers’ ire: tipping.

More Americans say they are frustrated with how often tipping is expected of them, according to a survey conducted by consumer financial services site Bankrate. About one in three U.S. adults said they thought the tipping culture “has gotten out of control,” according to a survey conducted in May.

University of Nevada, Las Vegas professor Marla Royne Stafford said recent shifts in tipping culture can largely be attributed to changes in technology. Many modern point-of-sale systems prompt customers to provide a tip, effectively changing the narrative from “would you like to tip?” to “what would you like to tip?”