diff --git a/examples/Peripherals/ADC/Internal_channels/Internal_channels.ino b/examples/Peripherals/ADC/Internal_channels/Internal_channels.ino
index 373e8d9..35644dc 100644
--- a/examples/Peripherals/ADC/Internal_channels/Internal_channels.ino
+++ b/examples/Peripherals/ADC/Internal_channels/Internal_channels.ino
@@ -54,6 +54,13 @@ void setup() {
static int32_t readVref()
{
+#ifdef STM32U0xx
+ /* On some devices Internal voltage reference calibration value not programmed
+ during production and return 0xFFFF. See errata sheet. */
+ if ((uint32_t)(*VREFINT_CAL_ADDR) == 0xFFFF) {
+ return 3300U;
+ }
+#endif
#ifdef __LL_ADC_CALC_VREFANALOG_VOLTAGE
#ifdef STM32U5xx
return (__LL_ADC_CALC_VREFANALOG_VOLTAGE(ADC1, analogRead(AVREF), LL_ADC_RESOLUTION));
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