Yum Brands on Thursday warned that its 2020 results could fall short of its long-term outlook as the Wuhan coronavirus outbreak weighs on sales in China and Pizza Hut struggles to turnaround its U.S. business.

Shares of the company slid more than 4% in morning trading.

"While Yum's business model is highly diversified such that the impact on our financial performance will not be as significant as what many companies will experience, this will certainly be a headwind for 2020," CEO David Gibbs told analysts.

Yum's long-term outlook includes annual same-store sales growth in a range of 2% to 3% and net new restaurant growth of 4%.

Here's what the company reported, compared with what Wall Street was expecting based on a survey of analysts by Refinitiv:

Earnings per share: $1, adjusted, vs. $1.13 expected

Revenue: $1.69 billion, vs. $1.66 billion expected

Same-store sales: 2%, vs. 2.3% expected

Taco Bell's parent company reported fiscal fourth-quarter net income of $488 million, or $1.58 per share, up from $334 million, or $1.04 per share, a year earlier.

The company's minority stake in Grubhub trimmed earnings per share by 5 cents. Grubhub struggled in 2019 as fierce competition with DoorDash, Uber Eats and Postmates put pressure on its business.

Excluding refranchising gains and other items, Yum earned $1 per share, missing the $1.13 per share expected by analysts surveyed by Refinitiv.

Net sales rose 9% to $1.69 billion, topping expectations of $1.66 billion. The company reported same-store sales growth across KFC, Pizza Hut and Taco Bell of 2%.

Yum announced in January that it would be adding a fourth brand to its portfolio: Habit Restaurants, which owns the Habit Burger Grill. The acquisition is expected to close in the second quarter.

Pizza Hut was once again the laggard during the quarter. Same-store sales at the pizza chain fell 2%, a steeper drop than expected by analysts. In the U.S., same-store sales fell even further, declining by 4%. Gibbs said Thursday that the company has named Kevin Hochman, who led KFC's turnaround in its home market as its U.S. president, as the interim president of Pizza Hut's U.S. division.

KFC's same-store sales increased by 3%, even as Popeyes Louisiana Kitchen's chicken sandwich returned to restaurants permanently in November. Taco Bell's same-store sales grew by 4% in the fourth quarter.

On Wednesday, Yum China, which was spun off in 2016, warned that the Wuhan coronavirus will likely "materially affect" its 2020 sales and profits. The Chinese licensee of KFC and Pizza Hut said it could report an operating loss in the first quarter. China is KFC's largest market by systemwide sales and Pizza Hut's second largest.

Gibbs told analysts that he has been in regular contact with Joey Wat, the chief executive of Yum China.

Yum China has temporarily closed about a third of its restaurants in the country, and those still open have seen sales drop dramatically. Same-store sales during the Lunar New Year holiday fell by 40% to 50% from a year ago. In response, Yum China has rolled out "contactless delivery" so customers do not have to engage with employees to pick up their food from a restaurant.