diff --git a/soc/arm/st_stm32/stm32wb/soc.c b/soc/arm/st_stm32/stm32wb/soc.c
index 0a1a5f46e3a..4adf34d9cc0 100644
--- a/soc/arm/st_stm32/stm32wb/soc.c
+++ b/soc/arm/st_stm32/stm32wb/soc.c
@@ -45,6 +45,10 @@ static int stm32wb_init(const struct device *arg)
 	/* At reset, system core clock is set to 4 MHz from MSI */
 	SystemCoreClock = 4000000;
 
+	/* Set C2 Power Mode to shutdown */
+	/* It will be udated by C2 when required */
+	LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
+
 	return 0;
 }