The episode shown on Bank Holiday Monday saw Eva Price, played by Catherine Tyldesley, visit Audrey's hair salon, where she remarked: "I have more roots than Kunta Kinte. No idea who that is, by the way, just something my mum used to say."
Kunta Kinte was a character from the novel Roots: The Saga Of An American Family, which was adapted into a hit TV miniseries. Based on a real-life ancestor of author Alex Haley, it tells the story of a young man taken from Gambia and sold as a slave.
The show received almost 300 complaints, The Guardian reported.
A spokeswoman for the soap said: "We apologise if this dialogue has caused offence."
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