diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
index c5a715b5..d59d1549 100644
--- a/cores/arduino/wiring_analog.c
+++ b/cores/arduino/wiring_analog.c
@@ -38,7 +38,7 @@ void analogReference(uint8_t mode)
if((mode == EXTERNAL) || (mode == VDD)) {
/* Set reference in ADC peripheral */
- ADC0.CTRLC |= mode;
+ ADC0.CTRLC |= mode | ADC_SAMPCAP_bm;
/* If reference using internal reference from VREF */
} else if (
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