The energy bar maker voluntarily recalled three of its flavors on Thursday after discovering that they contained ingredients supplied by SunOpta (STKL), which in May recalled many of its sunflower kernels for possible listeria. SunOpta’s move triggered a recall of about 100 snack foods that used its affected kernels, and other protein and granola bar makers have since also issued warnings about their products.

Clif Bar’s recall includes its Mojo Mountain trail mix bars, Sierra Trail Mix energy bars, and Nuts & Seeds energy bars, with “best by” dates ranging from this month to 2017. (For the specific dates of the recalled products, see Clif Bar’s full announcement.)

The company was not able to say how many Clif Bar boxes are affected by the recall in response to a request from Fortune, but said it has not received any reports of its customers falling ill. Symptoms of a Listeria monocytogenes infection range from fever to flu-like discomfort and stomach problems, and can sometimes be fatal in pregnant women, children and the elderly.

Concern about listeria, and the potentially contaminated sunflower kernels, has recently prompted several companies to preemptively recall products before anyone gets sick. This week, Kellogg (K) brand Kashi recalled one of its cereals and bars that included SunOpta sunflower seeds, following a recall last month of Quaker Oats granola bars, owned by PepsiCo (PEP), for similar reasons.