diff --git a/soc/arm/st_stm32/stm32h7/soc_m7.c b/soc/arm/st_stm32/stm32h7/soc_m7.c
index 4ae3611ee2e..ae6215163bd 100644
--- a/soc/arm/st_stm32/stm32h7/soc_m7.c
+++ b/soc/arm/st_stm32/stm32h7/soc_m7.c
@@ -24,7 +24,7 @@ static int stm32h7_m4_wakeup(struct device *arg)
 	LL_AHB4_GRP1_EnableClock(LL_AHB4_GRP1_PERIPH_HSEM);
 
 	if (IS_ENABLED(CONFIG_STM32H7_BOOT_CM4_CM7)) {
-		u32_t timeout;
+		int timeout;
 
 		/*
 		 * When system initialization is finished, Cortex-M7 will