diff --git a/testhal/STM32/multi/ADC/cfg/stm32g071rb_nucleo64/portab.c b/testhal/STM32/multi/ADC/cfg/stm32g071rb_nucleo64/portab.c
index 76a34150c..e67ad9fb1 100644
--- a/testhal/STM32/multi/ADC/cfg/stm32g071rb_nucleo64/portab.c
+++ b/testhal/STM32/multi/ADC/cfg/stm32g071rb_nucleo64/portab.c
@@ -89,7 +89,7 @@ const ADCConversionGroup portab_adcgrpcfg2 = {
   .cfgr1        = ADC_CFGR1_CONT |
                   ADC_CFGR1_RES_12BIT |
                   ADC_CFGR1_EXTEN_RISING |
-                  ADC_CFGR1_EXTSEL_SRC(0),
+                  ADC_CFGR1_EXTSEL_SRC(5),
   .cfgr2        = 0,
   .tr1          = ADC_TR_DISABLED,
   .tr2          = ADC_TR_DISABLED,