diff --git a/arch/arm/cpu/armv7m/stm32f4/flash.c b/arch/arm/cpu/armv7m/stm32f4/flash.c
index e5c6111330..ae6379070f 100644
--- a/arch/arm/cpu/armv7m/stm32f4/flash.c
+++ b/arch/arm/cpu/armv7m/stm32f4/flash.c
@@ -114,9 +114,9 @@ int flash_erase(flash_info_t *info, int first, int last)
 			;
 
 		clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
-		stm32f4_flash_lock(1);
 	}
 
+	stm32f4_flash_lock(1);
 	return 0;
 }