diff --git a/src/flash/nor/stm32l4x.c b/src/flash/nor/stm32l4x.c
index 2cc378a90..4b7edae5f 100644
--- a/src/flash/nor/stm32l4x.c
+++ b/src/flash/nor/stm32l4x.c
@@ -1038,7 +1038,7 @@ static int stm32l4_probe(struct flash_bank *bank)
 	/* in dual bank mode number of pages is doubled, but extra bit is bank selection */
 	stm32l4_info->wrpxxr_mask = ((max_pages >> (stm32l4_info->dual_bank_mode ? 1 : 0)) - 1);
 	assert((stm32l4_info->wrpxxr_mask & 0xFFFF0000) == 0);
-	LOG_DEBUG("WRPxxR mask 0x%04" PRIx16, stm32l4_info->wrpxxr_mask);
+	LOG_DEBUG("WRPxxR mask 0x%04" PRIx16, (uint16_t)stm32l4_info->wrpxxr_mask);
 
 	if (bank->sectors) {
 		free(bank->sectors);