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Diffstat (limited to 'drivers/tty/serial/stm32-usart.h')
-rw-r--r--drivers/tty/serial/stm32-usart.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 41d974923102..cd97ceb76e4f 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -31,7 +31,7 @@ struct stm32_usart_info {
struct stm32_usart_config cfg;
};
-#define UNDEF_REG ~0
+#define UNDEF_REG 0xff
/* Register offsets */
struct stm32_usart_info stm32f4_info = {