diff --git a/ports/nrf/modules/machine/adc.c b/ports/nrf/modules/machine/adc.c
index fc5305e5242b8..7eb69b511ef18 100644
--- a/ports/nrf/modules/machine/adc.c
+++ b/ports/nrf/modules/machine/adc.c
@@ -143,7 +143,7 @@ STATIC mp_obj_t machine_adc_make_new(const mp_obj_type_t *type, size_t n_args, s
         .resistor_n = NRF_SAADC_RESISTOR_DISABLED,
         .gain       = NRF_SAADC_GAIN1_4,
         .reference  = NRF_SAADC_REFERENCE_VDD4,
-        .acq_time   = NRF_SAADC_ACQTIME_3US,
+        .acq_time   = NRF_SAADC_ACQTIME_40US,
         .mode       = NRF_SAADC_MODE_SINGLE_ENDED,
         .burst      = NRF_SAADC_BURST_DISABLED,
         .pin_p      = 1 + self->id, // pin_p=0 is AIN0, pin_p=8 is AIN7