They’re going to need a bigger boat.

Two South Australian cops on sea patrol got a “Jaws”-dropping sight — a great white shark tailing their dinghy.

The officers were aboard their 18-foot Investigator 2 on the lookout for law-breaking sailors at Tapley Shoal, about 9 miles east of Edithburgh, when the massive shark got chummy.

Melbourne fisherman Mark Oats told ABC Radio Adelaide Breakfast that his friend suddenly uttered an expletive and said, “Look at the size of this thing that’s come up behind us!”

The approximately 16-foot-long sea beast brushed up against their engine, abc.net.au reported.

“We kind of had thoughts of changing our Bonds [underwear] a couple of times,” Oaks said. “At the same time, the coppers were out there with their big patrol boat and they had another two guys on the inflatable.”

The cops on the rubber boat were on their way toward the two pals to conduct a Breathalyzer test.

“I told the boys to back off a bit because the shark was right next to us,” Oaks said.

“For probably the next 10 or 15 minutes we just sat around. The police brought the big boat in, which is where the footage from above the shark has come from,” he said.

“There was very little fish caught that day, I can tell you.”

Police later named the great white Noah.

“Noah wasn’t keen on being breath tested and our Water Operations Unit officers were happy to oblige!” police said on the department’s Facebook page.