diff --git a/boards/arm/stm32l4/nucleo-l496zg/configs/nsh/defconfig b/boards/arm/stm32l4/nucleo-l496zg/configs/nsh/defconfig
index 068ef8b8fa2..f4b6c169d4a 100644
--- a/boards/arm/stm32l4/nucleo-l496zg/configs/nsh/defconfig
+++ b/boards/arm/stm32l4/nucleo-l496zg/configs/nsh/defconfig
@@ -61,6 +61,7 @@ CONFIG_SERIAL_TERMIOS=y
 CONFIG_STACK_COLORATION=y
 CONFIG_STM32L4_ADC1=y
 CONFIG_STM32L4_ADC1_DMA=y
+CONFIG_STM32L4_ADC1_EXTTRIG=1
 CONFIG_STM32L4_ADC1_SAMPLE_FREQUENCY=1000
 CONFIG_STM32L4_ADC2=y
 CONFIG_STM32L4_ADC2_DMA=y