diff --git a/ports/raspberrypi/common-hal/pulseio/PulseIn.c b/ports/raspberrypi/common-hal/pulseio/PulseIn.c
index 346c0951ed0f..70d542246ed3 100644
--- a/ports/raspberrypi/common-hal/pulseio/PulseIn.c
+++ b/ports/raspberrypi/common-hal/pulseio/PulseIn.c
@@ -173,8 +173,10 @@ uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t *self) {
         mp_raise_IndexError_varg(translate("pop from empty %q"), MP_QSTR_PulseIn);
     }
     uint16_t value = self->buffer[self->start];
+    common_hal_mcu_disable_interrupts();
     self->start = (self->start + 1) % self->maxlen;
     self->len--;
+    common_hal_mcu_enable_interrupts();
     return value;
 }