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(Pocket-lint) - Amazon didn't do as well as expected in the fourth quarter, so it is considering something it hasn't done in years: increasing Amazon Prime's yearly fee.

Amazon's Q4 2013 earnings results revealed a profit of $239 million. That's more than double what it had in the same quarter the previous year. Amazon also earned $25.59 billion in revenue during the quarter, which is also a year-on-year increase for the quarter.

As for the full-year profit, it amounted to only $274 million. That's better than the $39 million loss from 2012, but the company still missed analysts' expectations of 66 cents a share on $26.06 billion in revenue. So Amazon is probably looking for ways to increase revenue.

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One such way is raising the price of its $79 a year Prime service in the US by $20-$40, according to Tom Szkutak, Amazon's chief financial officer. Amazon Prime, which launched nine years ago and has millions of subscribers globally, is a free two-day shipping service for a flat annual fee. 

That fee has remained unchanged for quite some time. But Szkutak confirmed during the company's fourth quarter earnings call with analysts that Amazon is "considering" a price hike in the US. He didn't blame the potential change on a dismal quarter though - but rather the higher cost of shipping today.

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In a similar move, Amazon recently altered its minimum amount for free shipping on non-Prime product orders to $35. Amazon didn't explain why it raised the minimum by $10, but many now assume it was also related to the higher cost of shipping.

Writing by Elyse Betters.