Prime Minister Yoshihide Suga said Thursday that the government’s decision to suspend use of some 1.63 million doses of Moderna Inc.’s COVID-19 vaccine — a move that followed the discovery of foreign materials in one batch — will have little impact on its national vaccine rollout plans.

“I’ve received a report from the health ministry saying that it will not have a big impact,” Suga told reporters. “I have instructed the health ministry that safety is the top priority.”

Nonetheless, the incident is another bump in the road for Suga’s goal of completing both rounds of vaccination for 80% of all residents by early October.