diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 89d7bd3..d84476e 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -160,7 +160,7 @@
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&uap->port, ch, regs))
+		if (uart_handle_sysrq_char(&uap->port, ch & 255, regs))
 			goto ignore_char;
 
 		uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);