How to disable the WDT (watchdog timer)?

After enabling and starting the watchdog timer (RR0), how can it be disabled?

This following code does not work:

NRF_WDT->RREN &= ~(1 << WDT_RREN_RR0_Pos);

Neither does:

NRF_WDT->POWER = 0;

Edit: I'm using a Rev G0 chip.

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