The single sold 99,000 in the week ending February 26, taking its overall sales tally to 6.68 million.
The track now remains behind only Black Eyed Peas' I Gotta Feeling - which has cumulative sales of 7.82 million - as the biggest-selling digital single of all time. Lady Gag's Poker Face is third.
The top 10 downloads of all time in the US:
1. Black Eyed Peas - I Gotta Feeling (7.82 million)
2. Adele - Rolling in the Deep (6.68 million)
3. Lady Gaga - Poker Face (6.62 million)
4. Lady Gaga - Just Dance (6.53 million)
5. Black Eyed Peas - Boom Boom Pow (6.34 million)
6. LMFAO - Party Rock Anthem (6.26 million)
7. Flo Rida - Low (6.23 million)
8. Ke$ha - Tik Tok (6.22 million)
9. Jason Mraz - I'm Yours (6.02 million)
10. Taio Cruz - Dynamite (5.90 million)